I did. My problem is not the installer. That ran perfectly. My problem is the files that are supposed to be grabbed by the launcher when play is clicked. Since I can't run minecraft.exe through a proxy, and I can't disable the proxy, my only option is to manually grab certain files and put them into the correct directory.
Is it possible to manually download
1.15.1-forge-30.0.51.jar
or any other example of that type of file. I need it because I've got a proxy, and can't run Minecraft.exe through it.
Also, if I need a .json file, can I download it manually? I'd presume it would be put into the same folder as the jar.