I get the following error when I check for new updates on Linux Mint 17.2
Failed to fetch http://apt.insynchq.com/mint/dists/rafaela/non-free/binary-amd64/Packages 403 Forbidden
Failed to fetch http://apt.insynchq.com/mint/dists/rafaela/contrib/binary-amd64/Packages 403 Forbidden
Failed to fetch http://apt.insynchq.com/mint/dists/rafaela/non-free/binary-i386/Packages 403 Forbidden
Failed to fetch http://apt.insynchq.com/mint/dists/rafaela/contrib/binary-i386/Packages 403 Forbidden
Some index files failed to download. They have been ignored, or old ones used instead.