I upgraded my dev site from v1.1.3 to v.1.3.5 with no problems a few weeks ago, and have been tinkering with it ever since.
I finally took the plunge and attempted to upgrade my live site just now. It got as far as v1.2.0 step 10, then gave me this:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator, [my email address] and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Can someone please help asap??