I didn't think renaming it would be a thing anyway, just wanted to make that clear.
I'm not worried about mods, the version isn't important either. Overall, I'm fairly certain that this isn't a problem with Forge itself, but rather with Java, and the problem is presenting itself through the Forge installer. In fact, the crash doesn't happen at the point where mods come into it and I'm fairly certain that the crash isn't even happening in the code of the Forge Installer itself, it's just a crash that Forge is reporting and nobody else will help me!
As for why I'm using 1.7.10, it's becuase I'm running a modpack. People don't, in my experience, usually make any updates for mods past 1.7.10, some do to 1.8, but I've only very rarely seen anything past that. Something about technical limitations bacause of some crap Microsoft pulled on the core Minecraft code.
If it helps to clear anything up, I have managed to do a workaround to this problem, and have successfully installed, run, and played on a server I installed using this version of Forge. The mods aren't the problem, and I'm fairly certain it's not the Forge Installer itself either.
Heck, just to be sure, I'll download the 1.11 version and tell you that it happens exactly the same.