If you experience multiple SQL error message related to a TRY_CONVERT operation when opening ShipWeight after installing a newer version of ShipWeight please check the version of the SQL Server you are using and the compatibility level of the ShipWeight databases. It need to be 2012 or later.
Even if you have a new server, be aware that the databases are not necessarily at the same version.
They can be set to be compatible with an older version.
To check the compatibility level of the databases, right-click and select "Properties", select "Options" and then check that the compatibility level is set to at least 2012. If it is set to earlier than 2012, then please change to 2012 or newer.