Apple sandbox regarding file renaming software

I only want to install an AppStore Apps !

The new Better rename 10 is NOT at the Appstore but the previous ver 9 is available there.

See Quote from a user review :

The Better Finder Rename from the company on their website is different than the Mac App Store. The ludicrously restrictive sandboxing rules the store imposes heavy-handedly on developers means the Mac App Store version is crippled in a few ways that makes the direct-from-developer purchase a no-brainer for anyone who will use the program seriously. (That pretty much applies to any application you can get elsewhere.)

So If Ill buy the previous 9 ver from the AppStore , Will I lose something or will it will be effective ?

Thanks

https://itunes.apple.com/us/app/better-rename-9/id414209656?mt=12

http://www.publicspace.net/ABetterFinderRename/index.html