OK, I have Dropbox on my computers.

I use Rainlander as my main calendar.

I can export Rainlander and then import it into Google Calendar.
But how do I get it to synch (I am using the free version of Rainlandar)?

I would like it to synch both ways, but if not I would like any changes I do in Rainlandar to automatically appear in Google Calendar.

Maybe there is a way via Dropbox?

Any ideas?