no, after you change your windows, use your license key. you can find your keys here inside your profile, at the top of the page, from dropdown menu, choose My Licences.

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I have license for 2 pc.

1 pc working, no problem. (website x5)

2 pc windows 8.1, (website x5) but i must reinstall windows 7. Hardware will not change. Only windows 7. When i reinstall from win8.1 to win7 on this second pc, whether it will berecognizedas license key.

Thanks

and sorry for my english.

first change your windows, then if your program didn't activate under your win 7, open a new post here and incomedia staff will fix it for you.

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Good Luck
https://nuluhost.com (compatible with x5 program, 30 days money back guarantee)
http://www.wdesigners.us (new)
http://www.usx5.com (coming soon)(Sign up)