--checkupdates doesn't work

Since I use the released Qt Installer Framework 2.0, I can't use --checkupdates anymore with the maintenance tool in the installed directory.

When I use maintentancetool.exe --checkupdates -v, I get "[0] create Error-Exception: Installers cannot check for updates."

Note that this is not the installation program, but the maintenance tool in the installation folder. It worked perfectly with the previous release of QtIFW (1.5).

Also note that the check still works with clients that installed the software before I upgraded to the new QtIFW. Is the maintenance tool not updated?