You can install unsigned apps on Windows just fine, maybe with one extra nag screen. Plenty of large open source projects don't sign their installers - VLC being one big example that many normal people use.
IIRC Windows is testing to turn that nag screen into a "no you don't". Which is such BS given all the evidence we have that malware vendors and bad actors have and continue to get their malware signed by MS because they simply can't reliably detect it.
https://www.electronforge.io/guides/code-signing/code-signin...