Semi-automatically downgrades your GTA IV installation to 1.0.8.0 or 1.0.7.0.

• Launch the tool.
• Select your game folder, the one that includes GTAIV.exe.
• Toggle Make GFWL-compatible if you don't plan to play with GFWL.
• Toggle other things if your heart desires so. Default options are fine, usually.
• Press Downgrade.
• Done!

• Downgrading the game to 1.0.8.0 or 1.0.7.0 - quickly or fully.
• Installing the base essential mods.
• Backing up the files that could be potentially replaced.
• Cleaning up the game folder from potentially incompatible things (*.asi, dsound.dll) before downgrading.
• Taking the selected toggles in account to automatically adjust logic (aka, the tool shouldn't let you do incompatible selections)

Downloads are a one-time only (unless an update is detected for UAL or FF)

• Full downgrade
• Downgrade radio
• Any of the mods

Contribution is highly welcome. I'm poorly experienced with C#, so the current code is extremely clunky and works out of prayers. There's also far too many checks that I have no desire to optimize.

Following NuGet packages were used to create this app:

• Microsoft-WindowsAPICodePack-Shell by rpastric, contre, dahall - allows to create a Choose File dialogue box.
• RedistributableChecker by bitbeans - saves some effort checking for installed VC++ redist.
• And Microsoft's official packages such as System.Management for convenience and functional code.