Use the "Import License File" option in the License Manager and locate the file on your USB drive or CD.
If you are a sign maker, vehicle wrapper, or wide-format print professional, you likely know that (now often called FlexiPRINT) is the industry standard. However, many shops still swear by the stability and specific features of FlexiSIGN Pro 8.1 v1 . flexisign pro 8.1 v1 install