1. Download the full game with all the patreon costumes at:
https://f95zone.to/threads/cursed-armor-v2-01-wolfzq.1193/page-48#post-632776
2. Next download 2.04 version which I believe is this one:
https://f95zone.to/threads/cursed-armor-v2-01-wolfzq.1193/page-107#post-1797968
3. Unrar both files and you will get two different folders with Cursed Armour (new 2.04) and Cursed Armour EV 1.9760 (old one with the patreon costumes)
4. first click onto Cursed Armour EV 1.9760 and open the folder and keep clicking the files as the directory is listed
Cursed Armour EV 1.9760 > www > img > pictures.
5. Once there copy the folder labeled 'Patreon' then paste it into the newer Cursed armour (2.04 version) in the same place essentially
Cursed Armour > www > img > pictures and overwrite the Pateron folder (if there is one)
6. Return to the old version and copy the folder custom from
Cursed Armour EV 1.9760 > www and there will be the a folder called custom there this is what I believe allows the game to read the patreon folder so copy it.
7. Then paste it in Cursed Armour > www and replace the custom existing custom file.
8. All the costume should be viewable and purchaseable.
Sorry for the confusion and I hope this works since it worked for me.
tl;dr find folder 'Patreon' and paste it in the exact the same place you found it into the newer version and copy 'custom' folder and also paste it where you found it. This should be the key to using the old patreon costumes.