I got 500 error when I have try to delete the sample booking on the admin console
just after installation.
I checked your FAQ and forum messages ... but found no problems.
Then, I checked your source code and found a suspicious mistake in a function
with get_home_url(). it should be something WPDEV_BK_PLUGIN_URL !
The plugin may works on the environment WP works on the document root, but I could not
move it because of the system limitation.
Could you inspect the problem ?
I have plan to get retail version, but I also feel unease for quarity ...