Yeah I'm grabbing Trine 4 day 1 also.
The difficulties you're having with the Trilogy pack are probably cos the team isn't quite finished porting Trine 3 yet; it's proving more difficult than the first two as it was made for 2015 PCs and PS4 while the first two were made for PS3/360 and PCs of 2010-2012. As of two days ago Frozenbyte tweeted that they don't have a solid release date yet as a result, but are "working hard to make it happen as soon as possible. Stay tuned".
Makes sense, cheers for the update. Gamestop in the US still has a release date of the end of July for the game but time will tell whether they hit that target..