What computer operating system do you have?
Have you read the Adobe document regarding workaround for Premiere Elements 13/13.1 issue of no DV or HDV data capture firewire into a Premiere Elements Capture window. If not, please review
The last version of Premiere Elements that has the DV HDV data capture firewire feature is Premiere Elements 12/12.1.
If you are a Windows user, you might even consider
If you are a Mac user, you might even consider
As for the matter of finding and using Premiere Elements 7....
a. finding a vendor that still has Premiere Elements 7 in stock and purchasing it
b. if you purchased Premiere Elements 7 as a download from Adobe, then go to the Adobe web site "My Orders", see if you can find your order for the product.
If you can, download installation files might still be available from there.
Please review and consider the above and then let us know if any of it worked for you.