Thanks iko22, coming days or next week I'll try that and come back to you when I succeeded in setting up a W11 Pro VM and activating it with this license. Can take some elapse time - limited spare time for hobbying....
About 6/7 year's ago my brother bought my father a second-hand Dell Lattitude E5420 (HDD (!!) and just 4 GB RAM) with Windows 10 Pro from a small local computer shop, amateur refurbishing I think.
My father passed away 4 years ago and I have his laptop. Now I want to reuse that Windows 10 Pro...