https://invoiceexpert.uservoice.com/knowledgebase/articles/187502-update-database-version
Click the link to download the VistaDB.4.dll file, and click the "Save" button:
Now click "View Download":
Right click on the VistaDB.4.dll download and click "Open containing folder":
Right click on the VistaDB.4.dll file and click "Copy":
Click on white space on the right hand side of folder name:
Type in:
C:\Program Files\Invoice Expert
Then hit enter:
Right click in between the icons and click Paste:
Select the Copy and Replace option:
Select "Continue":