IronyModManager VS HedgeModManager

While I'm not currently using it, and you don't have to use for this mod collection, if you are looking for a way out of the paradox launcher I would strongly recommend the Irony Mod Manager for Paradox Games! You can read more about it here: https://github.com/bcssov/IronyModManager

I think I'm going to cheer you up, you can use this to "steal" and this to manage.

Irony Mod Manager has a conflict checker. It will catch most of your problems.

Dowser.exe, the launcher can be used, start the launcher, log into your Paradox account there and on the Paradox mods website. Once you're on the website you can subscribe to mods. Additionally, I would use the IronyModManager for enabling and disabling mods, personal experience is that mods tend to work better when using it than the regular one with the cracked game version. Not all mods will worked on the cracked version sadly or present on the Paradox mods website.

And there are mod managers like irony or Paradoxos. And pdx-unlimiter can also start pdx games and automatically activate the mods which were used on a given save game. Though I don't know how well any of these tools handle the DLC issue.

Use Irony Mod Manager. Make sure to check compatibility/the mods are updated.

Sadly the Irony Mod Manager is no longer supported and is already showing problems with the newest launcher. You must either find someone who can take over the project or install mods manually.

Here you go

Use STL to launch HedgeModManager by running ~/stl/prefix/steamtinkerlaunch hmm start

HedgeModManager: https://github.com/thesupersonic16/HedgeModManager/releases/

Quick update: No fix has worked for me unfortunately. I can get HMM booted and mods loaded but HMM will always crash when trying to boot Sonic Frontiers at the step 'Loading Codes'. I've documented my steps in the existing Github issue here: https://github.com/thesupersonic16/HedgeModManager/issues/219

At this point, trying to launch the game from Steam it would close. This is because the d3d11.dll file used by HMM is problematic and fails to complete when running in Proton. You'll need to manually delete it and replace it with this .dll file. (You'll have to rename it to d3d11.dll) You can read more about this current issue here if you're curious. Note: This means HMM will load MODS but not CODES. Here's hoping that compatibility will be fixed in the future.

Sonic GMI has been replaced by HedgeModManager which supports several sonic games and has code support which is pretty useful (I can't remember if sonic GMI does). Sonic GMI is much easier to make work on Linux while HedgeModManager is significantly more difficult. Here you can find instructions for hedgemodmanager on Linux. DO NOT FOLLOW THE TOP GUIDE, it apparently doesn't work as well and its for Sonic Forces. In the comments there is instructions and a script to run for Sonic Generations, make sure yo do everything it says. If you experienced issues which I have I can try to help you but as long as you follow the instructions I think it should be fine.