I recommend you borrow a PC to create a USB to repair Windows
https://www.microsoft.com/en-us/software-downlo...
See here the correct way to recover your files when repairing Windows:
https://www.ubackup.com/windows-10/reinstall-wi...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.