SH5 runs flawlessly on many people's PCs. I've personally run it on 4 different systems and have not suffered unfixable CTDs. CTDs are PC specific, not a symptom of the game.
Make sure that all of your drivers and hardware are all updated and that your PC can actually handle SH5. It's a pretty demanding game.
Search through the forums for the errors you've been getting and I'm sure you'll find someone else who had the problem and hopefully how to fix it.
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