Sierra won't install
Solution 1:
It is a 5 Gb file.
Find a place where you can download it in 1-2 hours (22 is not good). Apple store can do it for you! or at Starbuck coffee shop you can do it in about 2 hours :)
Also, Verify the downloaded file is correct.
Open a terminal window up (Applications -> Utilities -> Terminal) then type: cd "/Applications/Install macOS Sierra.app/Contents/SharedSupport" with those double quotes.
then type in:
shasum InstallESD.dmg
and after a couple minutes it should return: 139ef35e4af0da8286b2a3af326cb114d774f606 InstallESD.dmg