WordPress 5.5.1 update error

Thanks for the reply
by following the steps to recover my website I have downloaded the SQL backup.
BUT
The next step is unclear for me which is ; “Upgrade wordpress to an older version using Softaculous, just override the things, expect the database”

Can you please guide me about how to do that in softaculous step by step? just like you told about SQL backup step by step…In this way it will be much more easy for me to follow…