This seems to be a common problem with this keyboard. I've been trying to use it since v0.3b. It require a series of installs and resets and uninstalls and resets and reinstalls and resets. When you do get it to install, you wonder what you did wrong this time. I've not got v0.7 to work either.
Still, it is one of the best keyboards I've used so far, so I'm hoping someone will sort out the installation problems for us. So far folk are focused on customising it's output and improving its performance, which is fair enough. Once that is done, I do hope Tene will find a foolproof installation method for us. I will be donating or getting a commercial version of it. At the moment, I'm trying tengofree and after using PocketCM, not too impressed with it.
BTW, there is also a solution here, which involves a process of crossing your fingers on the device, I think!
http://pocketcm.com/phorum/read.php?19,1074
I always uninstall the previous version, restart then I install the new version. It works for me everytime. Make sure you do not activate any SIP when you install the new one.