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installing win 10 with img from media tool
i decided to reinstall everything starting with windows 7 then upgrading or using the free upgrade that i initialy used to get windows 10. but it seems that offer is no longer on the start menu bar \ task bar.
i have the img of windows 10 pro burned from media creation tool to a dvd.
can i use the dvd to simply just upgrade windows 7 to windows 10?
or do i need a serial key for windows 10?
i had some trouble with curse client and some audio stuttering in windows 10 when i used the free upgrade, but it didnt show until after i installed call of duty black ops III where it said i needed audio below 44000khz (sound blaster Z) to be able to open the game....... :\ and a bunch of bsod out of nowhere. i havent had a bsod on windows 7 for over a year so idk where that came from.
so back to the question. is there a upgrade function from the dvd (windows 10 pro; as in the free upgrade) or do i need a serial specifically for win 10?