Hello allinthemind2007 and welcome to the forum.
Have a look at
https://cgi.ikmultimedia.com/ikforum/viewtopic.php?f=12&t=24083In particular, if "SampleTank Custom Shop", version 3,7,3 is not in your User Area / My Products, then please
check the FAQs, via here. If they do not resolve the issue, there is a link at the top to the Technical Support form, for some one to one help. Response time is usually within 2 working days (US (East Coast) Business hours, generally), but in the current circumstances please allow some more time.