windows 8.1 on my mac corrupt

As i read in some message that i could "easily" upgrade from 8.1 to 11 i started the procedure.....
Upgrade stopped somewhere and it got stuck in windows 10.... Now i can't access windows 8.1 nor 10....
Can i delete windows version on my mac completely and possibly re-install 8.1 (i have a licence key + cd)?
And how do i do that?
Does it affect my mac in anyway?
Safari 15.6.1
Imac 27inch late 2013
Greetings
Jan Heine Blaauw
Heerenveen
Netherlands
 
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