I would say that the manual upgrade is the way to go, even for people without programming experience. After all, a manual upgrade doesn’t require any programming skills. All you need to do is download a ZIP file from the WordPress.org website, extract it, and upload it with FileZilla.
If you have some time and patience, along with the information in our knowledge base, forum and the knowledge base from WordPress, anyone should be able to update their WordPress site by hand. And as long as you backup your files and database before attempting the upgrade, you can always roll back to the previous version if something goes wrong.
Won’t prefer that as only core files will be corrupted with automatic update process which can be fixed by manually uploading latest version of wordpress without removing any file.
Actually there wasn’t any need of installation as only core files were corrupted so upload only core files would have fixed that or manual update WordPress would have fixed errors.
Okay i’m sorry but, When you click Update Now on WordPress Admin, WordPress stuck in downloading the zip file and haven’t made changes in WordPress, so should be only few people/nobody facing critical error (And that’s my case first time attempting update )
WordPress 5.5 is now available in Softaculous. That means that new installations can be created on this version right away, and existing installations managed through Softaculous can be easily updated to this version.
Many sites can’t be updated from Softaculous, so there are still sites which have to be updated manually.
iFastNet also pushed some changes to the free hosting servers which should improve the odds of the one click updater working successfully. I haven’t verified those yet myself.
(And that’s my case first time attempting update 
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