Windows 8 reinstalling with the same product key

Hello Guys ,
So I have founded this site in Microsoft :
Upgrade Windows with only a product key - Windows Help
which i think it may help me to reinstall windows ,
So I have windows 8 and i used some programs to get my product Key
then , i thought if i downloaded windows 8 again from the site and used the same product key i have now it will work .
So , what do you think guys ?

http://www.eightforums.com/tutorials/18309-windows-8-windows-8-1-iso-download-create.html

This will not work if you use an OEM or system builders product key.

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Have you tried this? -> Refresh or Reset your PC from the manufacturer recovery partition. You don't need Windows 8/8.1 DVD/USB/ISO.

Computer Type Laptop
System Manufacturer/Model Number Hewlett-Packard Pavilion G6 2321ee
OS Windows 8 Single Language

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If you have Windows 8 Single Language version (see screenshot below), then you must download Windows 8/8.1 Single Language version (see this link for help).

i tried reset and refresh , but there is problem with my computer , so thats why i want to reinstall , could please talk more about the single language version and from where i can get it from microsoft ?

kEmO said:

then , i thought if i downloaded windows 8 again from the site and used the same product key i have now it will work .

Click to expand...

Take a look at your MS store email, you find a link to download or buy a DVD.