very tired so im keeping this short
it's been verified that sha1 hashes of files from here:
http://www.microsoft.com/en-us/software-download/windows10isoare equal to MSDN (multiple editions).
you can also use the tool from here:
http://www.microsoft.com/en-us/software-download/windows10regarding activating win 10. first rule is that no iso will activate from a clean install unless it was first upgraded. when you run upgrade process it registers your hardware id to microsoft. once that happens. you can clean install as many times as you'd like, and it will activate after to connecting to ms servers. as of now it is activating for people using daz loader as well as kms activation. the forecast is that they will both continue to work. the daz loader method is slightly more guaranteed.
how to upgrade:
reserve your upgrade. should be availbale after running windows update. if you're having issues, try this - make sure all windows updates are installed. make sure windows update is set to automatic. then do this (its one or two commands) -
https://www.reddit.com/r/Windows10/comments/3exx29/preload_windows_10_if_you_dont_have_the_folder/2nd method. download ISO from one of above links. mount and then run upgrade from ISO.
remember, if you do not do upgrade, you will not receive win10 activation.
also, reminder, look at this --
http://i.imgur.com/RUQewKw.jpgedit:
Sorry I wasn't clear about daz vs kms.
what i mean is that as of now, microsoft is allowing daz and kms activated win 7 and win 8.1 to be eligible for free win 10 activation. most opinions are that it will stay that way. some are in doubt in regards to kms.