The last 2 Windows Tor Browser releases aren't signed properly?

Windows warns me when I go to run the installer

Hi. What warning message are you seeing? Which anti-virus software?

For reference: Antivirus blocking Tor Browser - Encountering issues - Tor Browser — Tor

I think Tor Project accidentally signed the latest installers with an expired Windows code signing certificate. This certificate was valid until Sept. 1st, 2026.

Just the normal Windows 10 warning screen that appears when you try to run unsigned installers. It says it was signed by an Unknown publisher or something like that. As the other person here says, likely your certificate expired accidentally or something?