Before doing anything, copy your original Data folder and SLRR.exe to a desktop folder named "SLRR_Vanilla_Backup".
Beyond the obvious fixes, the mod pack contains "Easter eggs" that veteran players love: slrr mod pack
If you try to run a stock, disc-era version of SLRR on Windows 10 or Windows 11, you will likely encounter a black screen, missing .dll errors, or a crash immediately after the intro video. The solves these core issues: Before doing anything, copy your original Data folder