EA App won't finish installing, error INST-14-1603

I'm getting error INST-14-1603 when running EAappInstaller.exe. It won't finish installing. Windows 10. It was installed just previously but I unfortunately decided to reinstall it.

I've tried the steps in the 'official' post for install issues: https://answers.ea.com/t5/Bug-Reports/INFO-EA-app-What-does-this-INST-Error-Code-mean/m-p/12420205

Also other things mentioned online aren't working: rebooting, installing on new user account, deleting EA folders in Explorer, downloading an .msi installer, disabling Windows a/v + firewall, boot into Safe mode.

How can I get this to just install?