Got the version from page 13 of this thread, attempted to install with the mod loader and it didn't like it. Tried again with FTD.zip file unblocked and it still didn't like it. The same two dialog boxes appeared both times, and both times Xenonauts had unrestricted permissions.
I also tried uninstalling xenonauts and reinstalling it with XCE 0.26 and the exact same problem persisted.
Should I just install it manually? Or would it cause problems because it wasn't liked by the mod loader?
Dialog 1:
Error: Unable to write on "assets/mods" directory.
Check program's permissions.
Dialog 2:
can't open file
'assets/mods/FTD\ufocontents\airplane.alien.assaultlander.andron.xml'
(error 3: the system cannot find the path specified.)
EDIT:
Experienced a very similar problem to this one while attempting to install Kabill's Armored Assault Mod through the mod loader aswell, so it's probably just XCE's exe that's being problematic.