Thanks for the solution!
I tried another way to track down the problem with v1.3.3. I searched the INI files where the values for the fans are saved. You can find them here:
Assuming that you start with a fresh system, you will find the file "Profile1.ini" with standard values and the software will run. If you change these values the software crashes on start. By trial and error I found out that the software seems to have difficults with the entry "lightMode" in the "Fan0"-section ("Fan1" to "Fan4" are not affected, just "Fan0"). It seems that I can change every other value without a software crash except these single one. But of course I have not tested changing all values.
So, if you want to or maybe you are forced to use v1.3.3, a workaround could be that you leave the value for "Fan0" (which is in fact your first fan based on the numbers on the controller) on standard and only change the other fans. For a better illumination of your case you can turn off the light of your first fan.
Hope this helps.