No guarantee but you could try contacting support and ask if they could provide you with any of the patches that have been removed from the library in meantime.

Because I had applied hotfix 4 loca, I ended up having to uninstall and completely start over. After installing everything else and getting up to hotfix 4 launcher, I got it all updated. However, after that, it complained about data mismatch. I went in and deleted the hotfix files from the data folder, but that didn't fix it. I am redownloading it now.

Not a HUGE deal, but just letting others here know that if they don't feel like jumping through all these hoops (especially the person/people who said they couldn't find all the patches they need), you may end up needing to completely re-download the game anyway, so it might just be worth starting with that rather than making the effort to get old patches or what have you.

I wish I had known this BEFORE jumping through all the hoops I have.

From my perspective, the issue is that they broke the upgrade path by releasing a dead end patch. If I can't trust the offline installers and patchers to work, then why am I buying from GOG instead of any other storefront?

I applied the broken patch path (only one available at the time) before the second path was available, so it's not a matter of paying attention.