Install mac sierra

Hi,

I have macbook pro late 2011, i download mac Osx sierra and try to install it by flash desk but it takes long time up to 12 hours and stop on 'about 0 seconds remaining ' and I tried to install it 3 times and same problem, finally I recovery old osx 10.7 and try to install sierra from application after Download it and till now after 24 hours still stop on same page.