SUMMARY Reporting a nastly web-page typo for Stellarmate. Sorry if this isn't the right place to report the bug... On https://stellarmate.com/support.html?view=kb&kbartid=5 in Switching to the Beta Channel, it says "The system should not be upgraded" I assume you mean NOW, not NOT. Hy
Stellarmate is not a software developed by the KDE community, which means that this is not the proper place to get support for it. Please contact its authors.