Update WordPress 5.5 error

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Check ‘Dashboard ? Tools ? Site health’ to see if your site have some problems.
Bu sure to have a backup before update. If the automatic update will fail, you can do a manual update. See more:

Updating WordPress

I tried to update manually but some 4-5 files failed to upload. I have replace the wp-admin folder and includes folder but WordPress admin not working, showing this error.
“There has been a critical error on your website. Please check your site admin email inbox for instructions”

@knowledgegallery WordPress needs all its files to work (with a very small amount of exemptions).
Possibly these files have different permission mode, see this article:

Changing File Permissions

If it will not help, try to contact your hosting.

@afid14 even if you have a similar problem it was needed to make your own topic (author of the topic is getting all comments).
The main information to help you is here:

FAQ Troubleshooting

Debugging in WordPress

Updating WordPress

I have exactly the same problem as Knowledgegallery when trying to update to version 5.5.1. Can anyone tell me why I this is happening and why I cannot update automatically. I’d rather not do the manual update because my WordPress knowledge is pretty limited and I don’t want to cause a problem with my website.