help new upgrades

Purchased ATV Flash about 1 year ago with extened upgrade (2 years I think).  I haven't upgraded for about 9 months.  What is best way to upgrade.  Should I put my ATV back to default and do a complete reinstall. This is what I prefer to do if there are any advantages.

 

If I do a reinstall, how to I download the lastest version on a usb.

 

Thanks,

 

Jim