Microsoft Silverlight

Microsoft discontinued Silverlight for Mac back in Dec 2016. It is 32-bit software and cannot run on macOS Catalina or later. You cannot use Windows 10 and Silverlight in a virtual machine on an M1 Mac either.

You have probably inquired already, but one would hope that the DoB would offer an HTML5 web solution for uploading files for those that no longer have access to a working Silverlight.

Parallels does offer the ability to run on an M1 Mac.

That said, the City of New York Department needs to be very concerned about Section 508. Limiting its services to outdated software reduces their accessibility, which as a public agency with possible Federal funding, the public could complain about.

I would contact the mayor's office and let them know that if they don't update their software, you will make a complaint.

I'm not arguing the point about Windows 11.

There is an ARM version of Windows 10, and Parallels is staking their own reputation on publishing it on their website.

The key is to have a temporary solution short of buying all different hardware just to be able to access a website until NYC gets its act on board.

I purposely omitted Parallels and the Microsoft unsupported Windows 11 arm edition. What would be the odds that Microsoft makes Silverlight available for Windows 11 on either platform? Implicitly, Windows 10 being Intel-based, is not going to run in Parallels on an M1 Mac.