I've finally managed to fix the game! Here's how, hope it works for you all too (just to clarify: DLCs and mods still work!):
* Boot up Steam, and open the developer console by pressing Windows+R, then pasting steam://open/console in the "Run" box and pressing Enter.
* In the developer console, paste the following: download_depot 206420 206421 32002699204955846
* These are the main SRIV files (packfiles, videos, etc.) from the last patch before the abysmal Re-Elected patch. They're 8,670 megs (almost 8,70 GB!), so they'll take some time to download.
* Once they download, paste the following in Steam's console: download_depot 206420 206422 6013726710204312506
* This is just 6 megs, and it's the old SRIV executable. You need it to play SRIV without the patch: the new executable won't work with the old files.
* Before you do anything with them, head to your Saints Row IV installation folder (by default, it's Steam -> steamapps -> common -> Saints Row IV) and delete the following files: SaintsRowIV.exe, sr_hv.exe, SaintsRowIV.ini & EOSSDK-Win64-Shipping.dll (thanks to RedAISkye for notifying me about the last one!)
* Now that you have the old files, you have to locate them. They're in your Steam installation folder, under steamapps -> content -> app_206420. There, you'll find the old files under the "depot_206421" and "depot_206422" folders.
* Copy and paste the content of both folders in your Saints Row IV folder. Replace all the new files with the old ones (they're 100 as far as I remember).
* Now, start the game in Steam.
* ???
* Profit! Now you can play SRIV again.
Just to clarify, I haven't tested co-op yet, but it should work with no problems. All of my old non-workshop mods work flawlessy, but I've yet to test if Workshop mods work. DLCs and their content work flawlessy, both customization and story-oriented. The MySteelport emulator works too, but with one odd quirk: the first time I booted up SRIV after fixing it, I went to Imagine as Designed/Imagined as Edges and loaded the character gallery, but forgot to start the MySteelport emulator. When I started it, I logged in just fine, but the game said I had no characters available for download. Just exiting the game and booting it up again fixed the issue, though, so it may not be something important but I'd like to clarify it just in case.
If any administrators/moderators find this message helpful you can post this info in other threads or make one dedicated to it. I was going to post this in a new thread but I didn't know where to post it (general chat or get help). If you have any questions regarding this, I'll answer them in a couple of hours. It's three in the morning here and I'm really tired
As a bonus, if you want to revert the game's Steam library appearance (logo, cover, background, etc.), here are the links to the original library assets:
* Small logo (capsule)
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/capsule_231x87.jpg?t=1486042711
* Big logo (large capsule)
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/capsule_616x353.jpg?t=1486042711
* Header
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/header.jpg?t=1486042711
* Cover
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/library_600x900.jpg?t=1567457337
* Background
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/library_hero.jpg?t=1567457337
* Logo
https://cdn.cloudflare.steamstatic.com/steam/apps/206420/logo.png?t=1567457336