What version of Windows are you running?  If it is an "S" version, you can only use aps from the Microsoft Store.  External aps can't be installed.

I use Windows 11

Hi @ericvallin 

Welcome to Trend Micro Community!

Could you please share a screenshot of the problem you encountered, along with an English translation, details of your computer's operating system, and the app you were attempting to install, including the filename and extension?