In-game, go to Preferences and untick/uncheck both "Water FX" and "Cloud Shadows"
Had this same issue - they warned us while installing it but I totally forgot. I got it to work after I did this
Comment History
Alexkazam - - 2 comments @ Ultimate Edition - HD Patch & Overhaul (EN/FR/DE)
Good karma+2 votes
Alexkazam - - 2 comments @ Ultimate Edition - HD Patch & Overhaul (EN/FR/DE)
Good karma+1 vote
I got this issue when using a cracked version of KoH. I could only get it to work for my Steam version
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