Quote Originally Posted by Deeprave View Post
Disable controlled folder access in Windows security settings.
Worked for me, thanks! Had the launcher allowed but the boot was still blocked for whatever reason.

For anyone getting the error, hit your Start Menu and type "controlled folder access" (or Settings (gear icon) > Updates & Security > Virus & Threat Protection > Manage Ransomware Protection).Then choose Allow an app through Controlled folder access > Add an allowed app > Recently blocked apps. You should see the FFXIV files there. Add ffxivboot.exe and ffxivlauncher.exe. Not sure if it's necessary but I also have ffxiv_dx11.exe added.