I just got this on the install...
!!Error in Package Installation
At least one error was encountered during a test installation of this package. It is strongly recommended that you do not continue with installation unless you know what you are doing, and have made a backup very recently. This error may be caused by a conflict between the package you're trying to install and another package you have already installed, an error in the package, a package which requires another package that you don't have installed yet, or a package designed for another version of SMF.
Installation Readme
SMF Gallery Pro - Video Addon
By: vbgamer45
http://www.smfhacks.comAllows vidoes to be uploaded to the Gallery System, or youtube linked videos.
Supports: avi,youtube,googlevideo,flv,wmv,mov,mpg
Requires SMF Gallery Pro 1.3
Install Actions
Installations actions for "SMF Gallery Pro - Video AddOn":
Installing this package will perform the following actions: Type Action Description
1. Execute Modification ./Themes/default/languages/Modifications.english.php Test successful
2. Execute Modification ./Themes/default/languages/Gallery.english.php Test successful
3. Execute Modification ./Sources/Gallery.php Test failed
4. Execute Modification ./Themes/default/Gallery.template.php Test failed
5. Execute Modification ./Themes/default/UserGallery.template.php Test successful
6. Execute Modification ./Sources/ManagePermissions.php Test successful
7. Extract Tree ./gallery
8. Execute Code videoinstall.php