Default Flashing problem

Hi guys, I hope you'll help me
i have not installed any os on my htc one mini, and the flashing of InstaCoin or the Pure rom (4.4.2 with sense 5.5) doesn't work. The last one says to me something as " unable to open zip file ".
I think i committed lots of mistake, but now i only want to have a working phone 'cause of i need it to work. Thanks
Luca