They let you download the .msixbundle file on Github. You can unzip it with 7-zip or some other zip program. And then you can unzip the file CascadiaPackage_x_x

They let you download the .msixbundle file on Github. You can unzip it with 7-zip or some other zip program. And then you can unzip the file CascadiaPackage_x_x64.msix which will give you the WindowsTerminal.exe binary. That should let you run it without admin rights.