If you don't find an email from Uniden, with the software key, in your email's junk mail folder, then one of the folowing happened:
the email address was typo'd
you did not select the option to download the software & receive the key, just downloaded software
or your email provider blocked the email.
Go back to the download
page.
Since you've already downloaded the software, use the option for "I just need the key".
Be sure to enter an email address that you know will not block the response, that will, at worst, put it in a 'bulk mail' folder where you can look for it.
If you use a client like Hotmail, you might want to add "order@uniden.com" to your contact list first, if your spam settings are to block any email from 'unrecognized senders'.