Hi dansemann,
are you on Windows or MAC OSX.
I guess you are on Windows.
If this is the case, you can try to reinstall Spark and make sure not install the VST 64 bit at the same place the the VST 32 bit. Otherwise, the 64 bit will overwrite the 32 bit and you will not be able to use it in Ableton (as it is not 64 bit).
Hope this helps
Best
Kevin