Peachtree 2017 not registering if I have Peachtree 2021 installed

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Hello,

I have a client who has Peachtree Version 2017 on their machine, as well as Peachtree 2021. Both were working together without an issue. Recently we had to remove 2017 due to a system error. We reinstalled it, but are now unable to register it online, and it will not open. If I uninstall Peachtree 2021, then 2017 will work without issue. Is there a way to use both versions on the same machine together like before?

Please let me know

thanks

Bob