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Added a 3.3.2 rollback option in steam.
I'll try to make sure that we have the info available on EU4 converter updates that are necessary but it's not something we aimed to address with this patch.
 
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I have a question, I tried to play today but game failed to boot up, ...

Wrong place to ask.
Better there in a new thread :

Aside from that i suggest to delete/rename/move evertyhing in the CK2 folder in Documents except the mod and save games folder
and try to start the game again. That worked for me with my recent crash issue on start, which was also the first for many years for me.
If that doesn't help you, manually (!) delete the CK2 folder in Steamapps and reinstall.