FlexiSIGN Pro 10.5.1 is not dead; it is "end-of-life" but not end-of-service for thousands of sign shops. The engine represents a specific moment in print history where Adobe's PDF transparency model met affordable wide-format printing.
To run without crashes, do not install it on modern high-end workstations. This software was compiled for Windows 7 x64. Ideal specs: flexisign pro 10.5.1 pdf rip 492
Here’s a factual breakdown of what this likely refers to and the context around it. FlexiSIGN Pro 10