michalblazek

WordPress update seems to be basic stuff. You just click Update now and that’s all. Unfortunately we have seen countless WordPress errors after various updates or rutine changes.
These are usually caused by using some deprecated codes or not compatible plugins. Sometimes there may be some issue with a server memory, PHP or database. We have recently started to use the checklist for WordPress core, plugins or themes update. 
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WP Update Checklist

Checklist for WordPress core, plugin updates and themes updates. What should your developer always check.

Jeff Sherk

DEPRECATED: As of WP v5.5 this plugins functionality is included in WP Core and this plugin is not required anymore. If you are running WP v5.5 or greater, you can de-activate and delete/remove this plugin. This plugin will still continue work fine with versions of WordPress less than v5.5.
WordPress will let you install a NEW plugin or theme from a zip file, but it does NOT allow you to upgrade them from a zip file. If you try to upgrade from a zip file, you will get an error message that says “destination already exists” and the upgrade will fail. WordPress will not allow you to upgrade from a zip file.
Update Theme and Plugins from Zip File will allow you to easily upgrade from a zip file, avoiding the “destination already exists” error message.
There is also an option to create a backup copy of the old plugin or theme, in case there is a problem with the new version.

Update Theme and Plugins from Zip File

Thanks, works great!

DEPRECATED: As of WP v5.5 this plugins functionality is included in WP Core and this plugin is not required anymore. Quickly and easily upgrade plugin …

WP Update Checklist vs Update Theme and Plugins from Zip File