Because the modules page only supports one branch right now, the only version you can get from there is the 2.4 (trunk) version. For now, 2.3 users should use these exports from the 2.3 branch. Don't forget to change the directory name to "dataobject_manager" and "image_gallery".
http://www.carlinowebdesign.com/assets/dataobject_manager_2.3.zip
http://www.carlinowebdesign.com/assets/image_gallery_2.3.zip