Could delete all plugins when upgrade 1.2.3?

Hello,
I have installed some plugins.
But I don't make sure could I delete all plugins?
If I direct upgrade 1.2.3 without delete opendkim plugins.
It' s will get error when I upgrade 1.2.3
But if I delete all plugins.All plugins settings will reset it.
How to upgrade 1.2.3 without delete plugins?
Some plugins can't update new version even I stay 1.2.2.
Like spamassassin new version.