You can try using an origin emulator to crack/bypass EA’s launcher. Here is one on cs.rin.ru that you can use https://cs.rin.ru/forum/viewtopic.php?f=29&t=115335. It should work by replacing files from your game with ones from the emulator and filling out any required info in the config file if any. Hope it works for you and saves you from downloading a whole repack. Let me know if there are any issues and I can try to help if I can
https://github.com/fn2006/PollyMC - Fork of prism launcher to allow offline play without an account.