Troubleshooting

Im confused, the download page has nowhere to log in before downloading, so how can we follow: 

"If so, you must download TurboTax Desktop after logging into your/their Intuit account."

When i log into the shared account (on desktop premier) i still get error 608. 

Based on what im reading, logging into the shared account first should give me the option to select the used key (only 1/3 computers used so far)