Hi, I have the same issue, and I used the official installer of Forge. I dont know how to install the libraries....
C:\Users\Usuario\Desktop\server>java -jar forge-1.12.2-14.23.5.2855.jar
2021-08-25 19:17:12,486 main WARN Disabling terminal, you're running in an unsupported environment.
[19:17:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLServerTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Using primary tweak class name net.minecraftforge.fml.common.launcher.FMLServerTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLServerTweaker
[19:17:12] [main/INFO] [FML]: Forge Mod Loader version 14.23.5.2855 for Minecraft 1.12.2 loading
[19:17:12] [main/INFO] [FML]: Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_301, running on Windows 10:amd64:10.0, installed at C:\Program Files\Java\jre1.8.0_301
[19:17:12] [main/INFO] [FML]: Searching C:\Users\Usuario\Desktop\server\.\mods for mods
[19:17:12] [main/WARN] [FML]: Found FMLCorePluginContainsFMLMod marker in Thaumcraft-1.8.9-5.2.4.jar. This is not recommended, @Mods should be in a separate jar from the coremod.
[19:17:12] [main/WARN] [FML]: The coremod thaumcraft.loader.ThaumcraftLoader does not have a MCVersion annotation, it may cause issues with this version of Minecraft
[19:17:12] [main/WARN] [FML]: The coremod ThaumcraftLoader (thaumcraft.loader.ThaumcraftLoader) is not signed!
[19:17:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Loading tweak class name net.minecraftforge.fml.common.launcher.FMLDeobfTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.common.launcher.FMLInjectionAndSortingTweaker
[19:17:12] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:17:13] [main/INFO] [FML]: Found valid fingerprint for Minecraft Forge. Certificate fingerprint e3c3d50c7c986df74c645c0ac54639741c90a557
[19:17:13] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:17:13] [main/INFO] [LaunchWrapper]: Calling tweak class net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper
[19:17:13] [main/INFO] [ThaumcraftLoader]: Downloading file https://dl.dropboxusercontent.com/u/47135879/Baubles-1.8.9-1.1.3.0.jar
[19:17:15] [main/ERROR] [LaunchWrapper]: Unable to launch
java.lang.RuntimeException: java.lang.RuntimeException: download error
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:169) ~[forge-1.12.2-14.23.5.2855.jar:?]
at net.minecraft.launchwrapper.Launch.launch(Launch.java:115) [launchwrapper-1.12.jar:?]
at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.12.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_301]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_301]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_301]
at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_301]
at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70) [forge-1.12.2-14.23.5.2855.jar:?]
at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34) [forge-1.12.2-14.23.5.2855.jar:?]
Caused by: java.lang.RuntimeException: download error
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.installError(ThaumcraftLoader.java:443) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.download(ThaumcraftLoader.java:433) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.install(ThaumcraftLoader.java:384) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.load(ThaumcraftLoader.java:606) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.loadDeps(ThaumcraftLoader.java:593) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.load(ThaumcraftLoader.java:523) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.load(ThaumcraftLoader.java:712) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.call(ThaumcraftLoader.java:737) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.call(ThaumcraftLoader.java:75) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:165) ~[forge-1.12.2-14.23.5.2855.jar:?]
... 8 more
Caused by: java.io.FileNotFoundException: https://dl.dropboxusercontent.com/u/47135879/Baubles-1.8.9-1.1.3.0.jar
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(Unknown Source) ~[?:1.8.0_301]
at sun.net.www.protocol.http.HttpURLConnection.access$200(Unknown Source) ~[?:1.8.0_301]
at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_301]
at sun.net.www.protocol.http.HttpURLConnection$9.run(Unknown Source) ~[?:1.8.0_301]
at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_301]
at java.security.AccessController.doPrivilegedWithCombiner(Unknown Source) ~[?:1.8.0_301]
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source) ~[?:1.8.0_301]
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(Unknown Source) ~[?:1.8.0_301]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.download(ThaumcraftLoader.java:429) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.install(ThaumcraftLoader.java:384) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.load(ThaumcraftLoader.java:606) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.loadDeps(ThaumcraftLoader.java:593) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader$DepLoadInst.load(ThaumcraftLoader.java:523) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.load(ThaumcraftLoader.java:712) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.call(ThaumcraftLoader.java:737) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at thaumcraft.loader.ThaumcraftLoader.call(ThaumcraftLoader.java:75) ~[Thaumcraft-1.8.9-5.2.4.jar:?]
at net.minecraftforge.fml.relauncher.CoreModManager$FMLPluginWrapper.injectIntoClassLoader(CoreModManager.java:165) ~[forge-1.12.2-14.23.5.2855.jar:?]
... 8 more
A problem occurred running the Server launcher.[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: java.lang.reflect.InvocationTargetException
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at java.lang.reflect.Method.invoke(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.run(ServerLaunchWrapper.java:70)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:main:34]: at net.minecraftforge.fml.relauncher.ServerLaunchWrapper.main(ServerLaunchWrapper.java:34)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: Caused by: net.minecraftforge.fml.relauncher.FMLSecurityManager$ExitTrappedException
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at net.minecraftforge.fml.relauncher.FMLSecurityManager.checkPermission(FMLSecurityManager.java:49)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at java.lang.SecurityManager.checkExit(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at java.lang.Runtime.exit(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at java.lang.System.exit(Unknown Source)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at net.minecraft.launchwrapper.Launch.launch(Launch.java:138)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
[19:17:15] [main/INFO] [STDERR]: [net.minecraftforge.fml.relauncher.ServerLaunchWrapper:run:75]: ... 6 more