Database Version 26 by redski - 2013-12-22

When I open GSAK, I get the following message in a popup dialog box:

The database you are opening is version: 26 but this copy of GSAK only supports up to version:19

Searches here didn't turn up anything relevant and I did not see any GSAK menu options that would allow me to restore an old database. I am using GSAK version 7.7.4.36.

Can anyone tell me how to fix this?

Thanks in advance.

Red
Geocaching username = redski