Thanks, Found it and reinstalled 2014. But it is crashing and I cant reopen it when ID 2015 is also still on my system.
In the end I uninstalled everything and then did a fresh reinstall for ID 2014. It now works OK.
Still a real pity I can't update to ID 2015 anymore.
I need ID 2014 because back stage in the ID 2015 things really change in the way FXL epub is generated.
Nowhere documented, so I found out the hard way :-(