There is no difference in the installer for Xeams Community and Enterprise Edition. It will run as if you have purchased the Enterprise Edition for the first 30 days. It will then get converted to Community Edition unless a license is purchased.
Please refer to http://www.xeams.com/backup.htm for instructions. On QNAP, the installation path will most likely by /share/CACHEDEV1_DATA/.qpkg/Xeams , provided you used the package available from our site.