"Inno Setup failed to install!" error.

[rok64-main]

I'm trying to install Cosmos OS Devkit, but after installing Inno Setup, it says "Inno Setup failed to install!" even though the installer said it was successful. I tried reinstalling it, turning off anti virus, and running as admin, but nothing is working, please help me.

[Dimkqo]

1. Check path in regedit: HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Inno Setup 6_is1 has key InstallLocation.
2. After that check that path is correct, then try installation again.

If it still not work, you can install it manually:

1. Install Cosmos extensions from Cosmos/artifacts/Debug/VSIX
2. Copy IL2CPU compiler build to UserDir/AppData/Roaming/Cosmos User Kit/Build/IL2CPU
3. Copy nuget packages path and add it to nuget package source like Cosmos Local Package Feed

[Owen2k6]

I resolved this by completely uninstalling inno setup and reinstalling it with the "for all users on this computer" which requires UAC. the one cosmos builder opens errors when i tried so i got it from the official download and CosmosOS now builds for me