This information is in the Important Notes section of the Readme help file and also the Release Notes.
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Upgrading to Adagio Invoices from Quik Invoice Plus for DOS
Adagio Invoices is no longer compatible with Quik Invoice Plus for DOS. However, Adagio Invoices 8.0A will convert Quik Invoice Plus databases. Once the database is converted you must not attempt to open it with Quik Invoice Plus. Opening an Adagio Invoices 8.0A database with Quik Invoice Plus for DOS corrupts the database. To avoid this problem we suggest you delete or rename the QIASP directory containing the Quik Invoices Plus program files.
Adagio Invoices is no longer compatible with DataCare for DOS. The DataCare for DOS integrity check will reports false errors. Adagio Invoices 8.0A installs a compatibility update to allow Adagio DataCare to check Adagio Invoices 8.0A databases.
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You will receive the following error when attempting to open Adagio Invoices, after converting the data and subsequently access the data with Quik Invoice Plus DOS:
"The Q/I data is not compatible with this version of Adagio Invoices."
The only solution is to remove the Invoices (QI*) data and restore from a data backup prior to the 8.0A conversion.