[Legacy] 1.5.2 FML broken due to dead link to deobfuscation data

[Cubius]

Hello,

feeling particularly nostalgic I've dug up a couple old Minecraft directories of saves and mods, and have been trying to get them running.

I've however run into some issues with version 1.5.2 in particular, and am stuck on an invalid checksum error:

Spoiler

2023-06-26 20:33:13 [INFO] [ForgeModLoader] Forge Mod Loader version 5.2.23.738 for Minecraft 1.5.2 loading
2023-06-26 20:33:13 [INFO] [ForgeModLoader] Java is Java HotSpot(TM) 64-Bit Server VM, version 1.8.0_51, running on Windows 10:amd64:10.0, installed at C:\Users\sblan\AppData\Local\Packages\Microsoft.4297127D64EC6_8wekyb3d8bbwe\LocalCache\Local\runtime\jre-legacy\windows-x64\jre-legacy
2023-06-26 20:33:13 [FINE] [ForgeModLoader] Java classpath at launch is C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\minecraftforge\minecraftforge\7.8.1.738\minecraftforge-7.8.1.738.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\scala-lang\scala-library\2.10.0-custom\scala-library-2.10.0-custom.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\sourceforge\argo\argo\3.2-small\argo-3.2-small.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\bouncycastle\bcprov-jdk15on\148\bcprov-jdk15on-148.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\com\google\guava\guava\14.0-rc3\guava-14.0-rc3.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\minecraftforge\legacyfixer\1.0\legacyfixer-1.0.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\minecraft\launchwrapper\1.5\launchwrapper-1.5.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\sf\jopt-simple\jopt-simple\4.5\jopt-simple-4.5.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\ow2\asm\asm-all\4.1\asm-all-4.1.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\java\jinput\jinput\2.0.5\jinput-2.0.5.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\net\java\jutils\jutils\1.0.0\jutils-1.0.0.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl\2.9.0\lwjgl-2.9.0.jar;C:\Users\sblan\AppData\Roaming\.minecraft\libraries\org\lwjgl\lwjgl\lwjgl_util\2.9.0\lwjgl_util-2.9.0.jar;C:\Users\sblan\AppData\Roaming\.minecraft\versions\1.5.2-Forge7.8.1.738\1.5.2-Forge7.8.1.738.jar
2023-06-26 20:33:13 [FINE] [ForgeModLoader] Java library path at launch is C:\Users\sblan\AppData\Roaming\.minecraft\bin\4255be29cfdb50bb02ebda15978b5e93f1ccc683
2023-06-26 20:33:13 [FINE] [ForgeModLoader] Enabling runtime deobfuscation
2023-06-26 20:33:13 [FINEST] [ForgeModLoader] All core mods are successfully located
2023-06-26 20:33:13 [INFO] [ForgeModLoader] Found a command line coremod : net.minecraftforge.legacy._1_5_2.LibraryFixerCoremod
2023-06-26 20:33:13 [INFO] [ForgeModLoader] [LegacyFixer] Removing CoreFMLLibraries: cpw.mods.fml.relauncher.CoreFMLLibraries@12f41634
2023-06-26 20:33:13 [FINEST] [ForgeModLoader] Discovering coremods
2023-06-26 20:33:13 [FINEST] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2023-06-26 20:33:13 [INFO] [ForgeModLoader] Downloading file http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] There were errors during initial FML setup. Some files failed to download or were otherwise corrupted. You will need to manually obtain the following files from these download links and ensure your lib directory is clean. 
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] *** Download http://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] <===========>
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] The following is the errors that caused the setup to fail. They may help you diagnose and resolve the issue
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] The downloaded file deobfuscation_data_1.5.2.zip has an invalid checksum e04c5335922c5e457f0a7cd62c93c4a7f699f829 (expecting 446e55cd986582c70fcf12cb27bc00114c5adfd9). The download did not succeed correctly and the file has been deleted. Please try launching again.
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] <<< ==== >>>
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] The following is diagnostic information for developers to review.
2023-06-26 20:33:13 [SEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: The downloaded file deobfuscation_data_1.5.2.zip has an invalid checksum e04c5335922c5e457f0a7cd62c93c4a7f699f829 (expecting 446e55cd986582c70fcf12cb27bc00114c5adfd9). The download did not succeed correctly and the file has been deleted. Please try launching again.
	at cpw.mods.fml.relauncher.RelaunchLibraryManager.performDownload(RelaunchLibraryManager.java:613)
	at cpw.mods.fml.relauncher.RelaunchLibraryManager.downloadFile(RelaunchLibraryManager.java:532)
	at cpw.mods.fml.relauncher.RelaunchLibraryManager.handleLaunch(RelaunchLibraryManager.java:165)
	at cpw.mods.fml.relauncher.FMLRelauncher.setupHome(FMLRelauncher.java:172)
	at cpw.mods.fml.relauncher.FMLRelauncher.relaunchClient(FMLRelauncher.java:104)
	at cpw.mods.fml.relauncher.FMLRelauncher.handleClientRelaunch(FMLRelauncher.java:38)
	at net.minecraft.client.Minecraft.main(Minecraft.java:2237)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at net.minecraft.launchwrapper.Launch.launch(Launch.java:57)
	at net.minecraft.launchwrapper.Launch.main(Launch.java:18)

When trying to just download the file at https://files.minecraftforge.net/fmllibs/deobfuscation_data_1.5.2.zip all I get is a 404, implying that perhaps the link is just dead, the file no longer hosted there. The fact that the error message is reporting having downloaded a file with a mismatched checksum makes me question that to some extent though.

I've also stumbled across this issue on the Github, which is close to a perfect match for the issue I am experiencing here. However deleting /lib/deobfuscation_data_1.5.2.zip from my minecraft directory has not made any impact.

I'd be grateful for any insights anyone here might have, or even if anyone can download forge for 1.5.2 and confirm that it's not just some issue with my installation specifically.