Can't install EA Desktop APP

Hi,

Recently I downloaded Sims 4 on steam and it required me to update the old Origin client to the "new EA Desktop app" to play it, but it simply fails to install, citing errorcode "INST-14-1603" whether I try to install it in a custom folder, or the default one. I've tried practically all the common fixes I could get my hands on with google but nothing seems to work on my end.

The following is a non-exhaustive list of things I've already tried:
-Remove Origin/EA Desktop app with any remaining folders or registry key I could find
-completely remove any "visual studio redistributable" package (not just the 2 suggested in the fix posts). I followed this up with a reboot straight into DISM and SFC /scannow into another reboot once they finished and do a clean reinstall of the 2013 and the 2015-2022 Redistributable
-I've tried to install it via the .msi file the "installer" it self downloads
-I've tried to create a secondary windows user wit ha short, simple characters only user name and install with that
-I've tried to completely disable all protection on my AV software

Nothing seems to work. The official installer cites the above mentioned "INST-14-1603", the MSI installers run to practically 99.99% where all files and everything is in place, it's starting the background services, then promptly starts "rolling back" and delete the files and services saying "the setup wizard ended prematurely because of an error" and to try later.

Any other suggestions what could I do to diagnose the issue further?