@xinso Thanks for finding the product.ini for build 10240. Findings are: 1. There is a Professional LTSB (ProfessionalS) SKU. 2. Bunch of older SKUs (CoreARM, ProWMC, CoreConnected etc.) is still there; just for compatibility reasons? 3. AFAIK, Education SKU supersedes ProfessionalStudent, but still its being kept.
Yes that is what I did. On 8.1, upgraded to 10. Took 15-20 mins. Then, formatted and clean install 10 and it was activated right off (just skipped the key at all times during install). So this becomes a 8.1 to 10 upgrade path. The question is what happens after 1 year. Also does it make sense to also book a 7 to 10 upgrade path. That might not be the case since win 10 activation is hardware dependent.