That's not a spelling error as the 's in this case refers to possessive, not plural.
You know, like saying "Samus's power suit" or the like.
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...I think you're over-complicating this.
There are three different ways to do this, but the end result is largely the same:
________Option A________
1. Acquire unmodified Japanese Realta Nua for PC in some manner (last I checked, this was no longer available for purchase even in Japan and required the use of a torrent)
2. Run the installer, pointing it to the according folders for each route from step 1
3. Enjoy
________Option B________
1. Via a torrent, acquire a portable pre-assembled copy of Ultimate Edition v0.9.1
1b. If you need a hint, search for cdda8a7b047a55e55baf38d7b842e886052aa1bd in a search engine (it's actually v0.9.1 despite it claiming to be v0.9.0)
2. run Fate.exe and enjoy
Bonus: You can optionally update to the v1.0 beta found in Quibi's signature
Optional: before launching the VN for the very first time, it can be a good idea to delete the "faterealtanua_savedata" folder to make sure you start fresh with the default settings. And if you don't want the H-content, straight-up just delete the file "patch_h.xp3"
________Option C________
1. Via Google Drive, acquire a portable pre-assembled copy of Ultimate Edition v0.9.0
1b. hint: /uc?id=1vu-1GURg2UclHMYpJVDGQjMVH_-5O5DH
1c. if you need a farther hint, consider that all Google Drive URLs begin with "drive.google.com" and are then followed by a slash, that being one of these→ /
2. Update to v0.9.1 via the patches in the first post, OR update to the latest v1.0 beta via the link in Quibi's signature.
3. run Fate.exe and enjoy
Optional: before launching the VN for the very first time, it can be a good idea to delete the "faterealtanua_savedata" folder to make sure you start fresh with the default settings. And if you don't want the H-content, straight-up just delete the file "patch_h.xp3"