After installing 1.4 from .deb on Ubuntu 18.04, I get a following error:
Err:1 http://apt.insynchq.com/ubuntu bionic InRelease
403 Forbidden [IP: 126.96.36.199 80]
E: Failed to fetch http://apt.insynchq.com/ubuntu/dists/bionic/InRelease 403 Forbidden [IP: 188.8.131.52 80]
E: The repository ‘http://apt.insynchq.com/ubuntu bionic InRelease’ is not signed.
N: Updating from such a repository can’t be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.