My site was running totally fine on Opencart version 220.127.116.11, but seeing the necessity to upgrade to Version 18.104.22.168 I eventually did it.
I didn't just upgrade as opencart guidelines. I took following steps to be on safer side...
# Backed up everything
# Changed the site theme to its default
# Uninstalled All Extensions, payment, order and all other modules that was not default.
# I renamed the existing folders: admin, catalog, system to new names
# Now I upload files of Opencart Ver: 22.214.171.124 to my hosting
# Next moved the Download folder to System (new one)
# Moved old admin/[url removed, login to view] to newadmin/[url removed, login to view]
# Moved image/data to image/catalog
# edited admin/[url removed, login to view] as required
# Now logged in to Opencart Admin, gave full access to Administrator
# Modified my settings
Now what I missed was Database restoration, thus all my data was missing. And I could now see whole website home page was showing broken & disrupted
For this I imported the previously backed up database. It imported my data but it couldn't do any better for the disrupted look of my website which is just because of some sort of error in redirection or other. Secondly the username and password for administrator which I was using to access admin panel is now showing error as "No match for Username/password". I made a recovery of password through forgotten link but the new password too is not working.
So all the errors that has to be addressed is been mentioned above. So pls kindly go through the project and,
Anyone Genuinely technically sound who can remove this single error..
Pls quote the lowest rates to work with.. as I m also looking forward to hire someone who can handle my all sites technical issues in regular as well ...