Since version 8.1 is a legacy version (released circa 2006), it relies on a physical license key rather than the modern cloud-based activations used by SAi Cloud . You can typically find the "paper" info in these locations:
: Flexi 8.1 originally shipped with a USB or Parallel security dongle. The code is often printed on a small tag attached to the dongle itself. Installation Prerequisites flexisign pro 81 v1 install install