Order Id: 6386
Joomla 1.5.14
JoomSEO 3.3.5

When I attempt to upgrade to the paid version, I get the following error:
"JoomSEF Upgrade Manager. File does not exist in upgrade package /admin/assets/strings.php

Attempted to install free 3.4.3 and received the same error

Verified strings.php is not in the package.

Any help you could provide would be greatly appreciated.
Thanks,
Jason