Can you make sure that you have all necessary assemblies available under :
\Program Files (x86)\EPiServer\Framework\6.2.267.1\bin
Yes, they're all there..
This looks like it's the same problem: http://world.episerver.com/Modules/Forum/Pages/Thread.aspx?id=49933&epslanguage=en
So If it's true that Deployment Center actually is done upgrading the site (except for the XForm part), perhaps it is sufficient to try this after the "failed" upgrade: http://world.episerver.com/Blogs/Paul-Smith/Dates1/2012/4/Problems-with-XForms-when-upgrading-to-CMS-6-R2/
What do you think?
Correct, if your site uses xForm then try using the script mentioned Paul's blog post. This should fix your problem.
After solving the issue described in my other forum topic, I stumbled upon a new one.
When trying to upgrade a CMS6 R1/Relate 2/.NET 4 site to R2, Deployment Center throws the following error:
Any suggestions on how to proceed?