If you posted here hoping for Bill to answer - I think you are out of luck. I believe he is not allowed to post in XC forum anymore.
The module(s) you have purchased from alteredCart - if they are encrypted you can use them now but if you upgrade your PHP or cart version in the future these modules will not work. The encryption will not be compatible with newer PHP version and XC may change code or tables.
What the email is telling you is that you can now purchase the module unencrypted so anyone can further modify it for you (or you can do this yourself). Whether it will be for PHP or XC compatibility or to simply tweak the module your way or add more features to it...
You do not have to purchase anything. Only if you plan of using these modules in the future. And in this case you can only benefit from that.
For sure none of the alteredCart modules are PHP 7 ready.
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Until now every single thing we bought for X-Cart stopped development and support quickly after they got our money
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Considering Bill has been around making XC modules for like 10 years this does not apply to him.