If you move the linked database ( TPSII_Data.mdb ) then you will need to open the UI database ( TPSII_Bill.mdb ) to specify where the linked database resides.  To do this you will need to open the UI database while holding down the Shift key.  This will stop the Macro from hiding the object window and showing the login prompt.  Once the database is open you will need to open the A004_Data_Location table and change the xxxxx field to reflect the location of the linked database file.

Standard user interface as shown in MS Access 2016, and showing the A004_Data_Location table.