It’s a Software World Now!
If you purchase a V2 (or own one now), you may wish to update its firmware periodically to take advantage of new features. Here are some key steps:

1. Go to the foc.us web site and create an account: https://www.foc.us/customer/account/login/
2. Log in with the account
3. Connect your V2 doc to your capable PC (or Mac)
4. On the left of your screen (once logged in), select “My Downloadable Products”
5. Click the “Microsoft Software” (or Mac) download button and install
6. Run the installed application and allow it to check and upgrade your V2 to the latest firmware

Source: Time to Take Another Look At foc.us tDCS and more | SpeakWisdom