It should work if you copy all files from the ZIP to the folder where mazebert is installed. This will replace all executables and keep your savegames and data.
Still not working for me Andy. I downloaded the new version last night and extracted it to a brand new folder and it keeps saying there is an update
Sorry guys! That's a bit embarrassing, I forgot to upload the 2.0.5 windows version :-/ I've uploaded it now, so once you download again it should work. Sorry for that!