Upgrade from 5 to 8

hello
I upgraded my mac to mac OS Catalina.
Now version 5 does not run any more so I bought version 8.
after the upgrade from version 5 to version 8 the stacks plugins and the partitions plugins are missing.
what can I do?
Thanks for your help

This should help.

Thanks for the answer,
I read and tried all this. But even version 5.4.1does not run on mac os 10.15 (Catalina)!
Is it not possible to find and install those missing plugins and stacks into version 8?
It is a rather big application and I cannot start all over!!!
Thanks for any advice!

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