I expect you'd like an answer before Jason comes in on Monday. :)
Not quite sure why you're having problems, maybe asking for an English install for a French map? ;)
However, somewhere on the CD there should be an .EXE file, possibly called Navigator which should install MM into the Program Files folder. But the software may well be out of date so you can dowload it directly from here
. When the software runs you may need to tell it where the maps are on the HDD using the Map : Map List : Refresh Map List pull-down menu.
Note: The MM application used to be about 5MB in two versions, "European" and "OS" (Ordnance Survey) and the correct version was required for some maps (that's the thing that can cause the "incorrect version" message). These are now combined into a single installer of about 18MB (despite what the web page says) which uses a new license management scheme. For this you will need to create an "account" on the MM website.