I may have found a froblem, actually, two problems:

So in the root (552)'s online version, the lamps are lit up, and the "secret" part behind the lab portal should have a karma portal leading to "pbu", but that doesn't happen in the downladable bersion.

Tha other problem is in the Resin room (cat), for some reason, I can only access 3 of the 11 screens in it, making it impossible to reach "ael".

I haven't played 4.5.1 yet, but I hope you fix these soon!