How to Upgrade windows 7 & 8 & 8.1 to windows 10 ::


 follow step:
           

                         1)      downloaded exe file will be 10-12 MB in size


       
click here to download



  • 2)     now double click on microsoft technical preview app and follow steps







 3)        now open control panel and click on check for update



4)   now click on check for update menu in sidebar           


  

5)     now it will show option for upgrade                           
                    
6)   click on get start now you are done.                             






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