Unable to Patch - Invalid serial number

[Malte279]

Hello,
on September 16th I purchased Forge of Freedom as a download from Metaboli Games. Along with the download file I received an order number and a "multiplayer key".
The later enabled me to install the game properly, but whenever I try to install the newest patch for the game (which according to internet reviews is to fix a couple of bugs I have already encountered in the game) the entering of that "multiplayer key" will just give me a note that the key is invalid and the patch can't be installed.
Ever since I have been exchanging emails with metaboli and playhistory.net
Who suggested that the latest patch might not be working for the downloadable version of the game and promised that there would be a new patch developed by their packaging department that would work with downloadable version of the game. So far nothing has been developed and I doubt it will, the much the more as I haven't seen anyone else with the same problem (so I suppose it might not be the patch itself after all that is causing the problem).
In the last mail I received from a worker at metaboli he suggested me to turn to this forum and ask if I could have my key replaced to see if the newest patch can be used with a different key.

I really think Forge of Freedom would be a truly awesome game for me if it wasn't for those bugs (e.g. Units just mysteriously vanishing from the turn based battlefields even though they were not anywhere near any combat or routed units at all, or even if they were surrounded so they should have surrendered rather than vanishing into thin air) which I hope would be solved by the most recent patch. Please let me know if this problem occurred before and if there is any way to mend it.

PS: I'm using Windows Vista and don't know if this might have anything to do with the problem.