[Koha] Downgrading Koha from version 21.11 to 20.11

[Admire Mutsikiwa]

I have upgraded my Koha version. I realised that some of the custom modules
I have added are no longer functioning as before. Is there a way to
downgrade from a higher version to a lower version , e.g from version 21.11
to 20.11?


Kind Regards,

-- 
The information transmitted by this email is intended only for the 
person 
or entity to which it is addressed. This email may contain 
proprietary, 
business-confidential, and/or privileged material. If you 
are not the 
intended recipient of this message, be aware that any use, 
review, 
retransmission, distribution, reproduction or any action taken 
in reliance 
upon this message is strictly prohibited. If you received 
this in error, 
please contact the sender and delete the material from 
all computers