@charles-jonkey Be aware no Magix staff is active here. We are all users like you. So this isn't "our" site.
Have you registered Acid 7 in the past with Sony? Your Sony customer account was transferred to Magix. Simply visit Magix.com and login with your Sony login credentials. You'll find Acid 7 as a download under My Products. I believe that Magix modified the installer because the old Sony registration servers no longer work.
If you haven't registered Acid 7 in the past you can contact customer support at infoservice@magix.net. They should be able to set up you a valid registration for you.
In the meantime you can download the 30 days trial version of Acid Pro 11.
@charles-jonkey The softwares are not officially compatible with Windows 7. I personally think that especially Video Pro X 14 could make problems because it also needs a relatively modern graphics card. Acid 10 might work but I don't know it for sure.
If the trial version of Acid 11 runs on Windows 7 then Acid 10 should work, too. The apps are nearly identical.