The DB has been stable for quite a while (that is the real compatibility item).
Kovid will notify us, if that become NOT backward compatible.
The PY thing is for the code, which the plugins use. If you stick with W7, you just need to pay attention to NOT load a PI that has been made incompatible
(the PI update notifier checks Calibre installed, so you should NOT see this... BUT... Keep a backup of the entire config folder, just in case you need to put older PI's back )
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