Damn … What a timing … few minutes before my update it was working. Then I discovered the 7.0.06 and i installed … and sbam … thank you for the hint. Now it seems it restarted
For the record, installing from the 7.0.5 installer on top of 7.0.6 should work if you really have to revert.
This only works within a major version as file format changes are not allowed. Going from 7.99 to 7 does not work