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Is it possible to upgrade Sugar without using the upgrade wizard due to error received after an upgrade?

Question asked by T G on Nov 28, 2014
Fatal error: Call to a member function checkVersion() on a non-object in /home/*******/public_html/custom/modules/Home/index.php on line 35


I have one database shared on two different websites. I upgraded one website to 6.5.15, which caused this above message on the one I upgraded, and this: Sugar CRM 6.5.15 Files May Only Be Used With A Sugar CRM 6.5.15 Database on the website that I didn't upgrade. 

Is it possible to upgrade the website using Filezilla, or some other fairly simple method? I am very, very new to this and I believe I've really screwed up the site.

Any help would be extremely appreciated.