Hello @Kerry, and welcome to Ext.NET Forums!
Have you acquired an Ext.NET 5 license? Ext.NET 4.x (and below) license keys should not
work with Ext.NET 5.
If you do have acquired an Ext.NET 5 license, please contact us via firstname.lastname@example.org
so we can better discuss the issue.
Hope this helps!
your screenshot contained hints on your license key; please refrain from posting sensitive information in public forums.