EDIT: Checksum of the installer that site offers matches that of the official 1.1.0.1 installer.
However, it's still a copyright infringement no matter what.
[SELECT ALL] Code:
[standard@nemo ~]$ md5sum assaultcube.exe
94dfec7b5fec65b3769af3e42f25b377 assaultcube.exe
[standard@nemo ~]$ md5sum AssaultCube_v1.1.0.1.exe.2
94dfec7b5fec65b3769af3e42f25b377 AssaultCube_v1.1.0.1.exe.2
[standard@nemo ~]$However, it's still a copyright infringement no matter what.