I installed the package OR OpenRemote_2.1.0.0617_x86.qpkg with a Java8 (from qnap app centre) on the Qnap TS-239ProII+ with QTS 4.2.4.
Then I updated the all folders in directory OpenRemote on a new folders from Controller 2.6.0 version.
When I to sync with online Designer - http://192.168.1.9:8088/controller/ ( i change port with 8688 to 8088), I get the working controller, with working Z-Wave and rules, and mail send (javaxmail). Also working Android app 2.3.0 on my smartphone.