I have a unlicensed dev server.
I followed the documentation to upgrade from v4 to v5.
All worked fine so far,
But I cannot edit the pages of my apps anymore.
The item “pages” is greyed out in the web gui.
It seems to be a license problem.
However, for testing, I installed a fresh copy on another system that did not have PSU before. Here an unlicensed version of v5 works nicely and lets me edit the apps and pages.