OptimizePress Theme not supported Post Thumbnails.

Hello.

My theme OptimizePress not supported Post Thumbnails.
I found a plugin Auto Post Thumbnail. This will solve my problem?
Dynamic Content Gallery it work if I have the plugins?
http://ww.wp.xz.cn/extend/plugins/auto-post-thumbnail/

p.s. maybe someone else has recommended plugins to solve this problem?

http://ww.wp.xz.cn/extend/plugins/dynamic-content-gallery-plugin/