This Wifi app installation issue seems to be a software bug that has to be addressed by their software engineering. The technical support team has no clue how to resolve it. It installs fine on a Win7 machine if it is an initial install. The issue is for subsequent install after your account has been set up as the account id is not being passed through.
Verizon WiFi hotspot seemed to be around since 7/2009. I am surprised after 4 years, Verizon doesn't know and has not addressed it. Win7 has been around since 6/2009. Wifi App does not run on Win8. Many people still use Win7. I hope Verizon is reading this and really do something. Somewhat disappointing experience. Notice no Verizon moderator replied to this thread.
For those who want to pursue further. The direct Verizon Mobile WiFi support number is 877-346-3053. If you call the regular support number, it will take your several bounce to get to the right place. I spent a whole afternoon with them on this.