If you get an ODBC error at start up, normally after upgrading SellerDeck or your OS then you need to update some information relating to how SellerDeck accesses the database.
There are two possible solutions - if one does not work try the other
First close down SellerDeck and any other application that may use Access, including MS Access itself if open.
Download and Run the MS Access Runtime for either Access 2010 or 2007
Try 2013 first
https://www.microsoft.com/en-gb/download/details.aspx?id=13255
Select the AccessDatabaseEngine.exe version and NOT the x64 one - even if your PC is 64Bit
Download then run and follow the on screen prompts
When completed re try to open SellerDeck
If it opens with no errors or problems - you are done.
If it still shows the ODBC error do the same again but from this link for Access 2007 Runtime.
https://www.microsoft.com/en-gb/download/details.aspx?id=4438
And repeat the steps above.
If this fails to help then contact Truska or, if support is directly with SellerDeck contact them directly.