I use both, I personally like the drawing feature on legacy edge, I find it useful for certain tasks even though yes it is becoming obsolete and can't display certain web pages anymore. Again I just like having it on my machine and would like to get this version from a Windows 10 insider build working.
I used for a long time Edge v. 10.0.21301.1010 (possibly the newest publicly available) and it worked for a lot of time, now it doen't work anymore, clearly they have some expiration date somewhere. Just use 10.0.19041.867 it works perfectly.
I've heard the Insider time-bomb works by having files signed with short-lived certificates, which expire quickly. Since they're now effectively unsigned, Windows won't run them. So copying different certs wouldn't help, since they don't match.
I see. Once the certificates expire on a beta build though the UWP apps will still run on a beta build so it is a little bit odd. And when do these certificates expire because I used a system that had its clock set to a date before the insider builds expired and never connected the system to the internet, and Edge still wouldn’t run on a stable build.
Just curious, how are you moving these Edge builds around? Are you running an installer, extracting component files, or copying raw files?
I am installing the Windows Internet Browser Package component that includes the Edge builds. On some builds I just copied the raw files.