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This important update only fixes problems related to 4Team Sharing Service and FTP Custom profiles. So it’s not necessary to install this update if a customer doesn’t use these profile types.
Bugs Fixed:

In some cases synchronization updates would not be synchronized correctly with 4Team Sharing Service the connection timeout occurs during synchronization process

If the Internet connection lost or unavailable when Sync2 was already running, in some cases all further attempts to start synchronization of Custom FTP or 4Team Sharing Service profile would fail unless Sync2 was restarted