If you are using a payment gateway, you
will need to upgrade your files to use the latest VPCart 9.00
files.
1. Download the new gateway files from the VPCart website –
http://www.vpasp.com/sales/epdownload800.asp
2. Unzip the downloaded file
into the folder where you installed VPCart 9.00.
3. Follow any gateway specific installation instructions from the readme.txt file.