You shouldn't need your account login details to download the software, firmware updates or the macros. Just go to
www.viking360.com, hover over Downloads, and click on The Viking Software. On the page that pops up, click on the download link. It might help if you Right-click and choose "Save As". This way you can tell your computer where to put the software when it downloads.
As a side note, you should have received an order confirmation e-mail and an account login detail e-mail immediately after your purchase went through. If you have not received these, check your e-mail's spam folders. If they are not there, then there's a good chance you didn't click SUBMIT on the last page and you order was never actually placed. Or, you may have mis-entered your e-mail address, which means the order confirmation or account login details went to the wrong e-mail address.