Sierra won't install
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