Thx Biomech and Presstab.
I'm fully synced now! But the new version overwrites the old wallet.dat
is that correct? I'm in %appadata% and can only find a new wallet.dat in the Truckcoin-folder.
you lost all your coins, same as I did.

aha, I got it! What you have to do is:
On Windows 7, go to start and in the searchbox type: %appdata%
Go to the map called "Roaming"
Then go to the map: Truckcoin and copy the wallet.dat to the clipboard.
then go to the map: Hyperstake > rename the wallet.dat to wallet-new.dat and paste the wallet.dat from the Truckcoin folder to this Hyperstakefolder.
That worked for me. I guess the older versions were using the Truckcoin-map and the new version the Hyperstake-map.
I'm having back all my coins