v2.4 comes with a file titled "license.txt" that contains the following sentences:

The Software is owned by Systems Leading Resource Limited and is protected by copyright
and other intellectual property laws.

You acknowledge that the Software constitutes valuable confidential information.

You may copy the Software into any computer format for backup if the copyright notice is also copied,
but you may not copy the Software for any other purposes.

The Software and all copies will remain under your control and you will safeguard the Software against unauthorised use.
You will not make the Software available to any other party without the written consent of Systems Leading Resource Limited.

Please note - the original sync libraries used in this software were taken from the Goocalsync project which was released under Apache license.

However the Goocalsync Application is owned by Systems Leading Resource Limited and is protected by copyright
and other intellectual property laws.

This clearly contradicts GNU GPL3.  Please remove it.