Dear Sir/Madam,

i have a problem with windows, i want to upgrade my windows 8 to 8.1 or later,
but windows 8 key are not work on windows 8.1, and microsoft say free upgrade how?
means all time recover 1st windows 8 than install upgrade 8.1 or later version, but windows upgrade size is 4GB and no one every time spend time and data.

can anyone solve those problem, (means we download those upgrade setup one time and use every time i recover old version )

or else any suggestion to avoid to buy new window version or avoid every time upgrade download ?

please replay............