Explorer is still there and there are ways to get Explorer again.
The simple way is to change the BHO folder to another name like oldBHO and BAM Explorer is back...and this thread also shows other ways...
C:\Program Files (x86)\Microsoft\Edge\Application\110.0.1512.48\
Then change BHO to oldBHO or something else and Explorer will open
Looks Like Internet Explorer Died Today
Or this way:
Trouble with new DS-2CD3B86G2T-IZHSY -missing part of menu
"
But I upgraded to Win11" .... yep still available:
Internet Explorer via W11