Due to the recent changes on what request are accepted by the server, Fabio had to rewrite large portions of the AmiCloud client.
You can grab the latest clients here
Support forum is available at www.a-mc.biz/support
A guide can be found here:http://www.indiego.rocks/file/download/84b8fdd861d80acd4f9ea9cae0512b36
And a video showing the sync from AROS to Windows and Linux can be found here:https://www.youtube.com/watch?v=Hgrpa1FIWoA