Scripts written in Surfer 7 (or higher) can be run in the current version of Surfer, as long as they are written in the Surfer 7 automation language.
If a script was written in Surfer 6 automation language, then it can be run in Surfer 7 but not in newer versions of Surfer. Surfer 7 supported both the older Surfer 6 automation model and the newer Surfer 7 automation model. The Surfer 6 automation model was dropped in Surfer 8.
You can differentiate between a Surfer 6 or a Surfer 7 script by the way Surfer is started (Surfer.App or Surfer.Application).
Set SurferApp = CreateObject("Surfer.App")
Set SurferApp = CreateObject("Surfer.Application")
If the script is written in the Surfer 6 automation model, it will need to be rewritten in the current automation model to work in Surfer 8+.
Updated October 2021