Moving omeka form one server to another

I have a existing omeka .10 version. now I want to shift it another server in fresh omeka 1.2.1. Archive, plugins and themes are overwritten and exported databases through mysqlAdministrator in GUI mode. but through browser it is not showing the existing data.

Have you tried following our instructions on moving to another server?

One thing we suggest is upgrading your installation in-place before trying to move it.

problem was with hph version and now it was solved.
I am upgrading but HtmlPurifire Plugin is not available in your server. whether it will be available, or not.

I have upgraded from omeka 0.10 to 1.2.1 to 1.3.2.
Now I am unable to upload 15MB Flim Clips. when i am trying it is showing the below mention error message---

"File Upload: The file 'kk.avi' could not be ingested because it has a disallowed MIME type (audio/unknown)."

kindly help me to solve it.