I had the same issue with macFUSE 4.0.5 and fixed it by downgrading macFUSE to 4.0.4. Now the problem has returned. Running VeraCrypt 1.24-Update 8 on macOS Big Sur 11.2.1 with macFUSE 4.0.4 returns "kext load failed: -603947007mount_osxfuse: the file system is not available (255)" when trying to mount existing encrypted volumes. Updating again to macFUSE 4.0.5 yields the error message "fuse: failed to exec mount program: No such file or directory." However, updating further to macFUSE 4.1.0 fixed...