This is a similar problem that I am having, but even less complicated and TurboTax is making it out to be grand theft larceny! I bought my disk from Costco as well and came home and installed it (using the provided disk) onto my desktop computer (which has a disk drive). When I tried to install it on my laptop (which doesn't have a drive) I followed the instructions to install it via the website on the disk sleeve, signed into my existing Intuit account, and entered the license code and got the dreaded "This license code has already been associated with an account. Please check that account and look for it in Downloads." When I installed the program on my desktop with the disk, it did not prompt me to log into or create an Intuit account, but installing it via the disk must have created a new account for me without me asking it to. How on earth do I find that account? This is incredibly frustrating.
