: On your phone, go to Settings > Update & Security > For developers and select Developer mode or Sideload apps .

The short answer is "probably not." Modern Windows 11 PCs can no longer run the Zune software needed for WP7. Windows 10 Mobile's activation servers are sporadic. However:

However, the format remains a cornerstone of the platform's homebrew community:

Before you can install these files from a PC, you must enable developer settings on your device: Windows 10 Mobile Update & Security For Developers and enable Developer Mode Windows Phone 8.1