I refer to your online shop / Store.
There's normally no login on our online store and no login is required to purchase. Also, since the installer is always freely available with no login required, there's no reason for wanting to login, other than this forum.
Could be you purchased something else from Digital River in the past, so you have a login with them ? Is this what you are trying to use ? If yes, it's not really required to download and install what you just purchased, the only utility of a Digital River login, is that you might purchase a product without having to enter your personal data again.
To retrieve a lost order, you should instead use the Self Help page here:
https://qlm1.net/virtualisoftware/qlmcustomersite/