There are certain models in "Model Templates for PROCESS for SPSS and SAS" (e.g. Models 23 through 27) which are not accessible via PROCESS. Can anyone advise me how to get access to these models? Thank you!
You are correct that Andrew Hayes' macro does not have built-in template for Model 25 (for example). As Cristian's recommendation implies, Hayes does discuss how to write syntax that the PROCESS command will act on: See appendices A (part of which is in Cristian's link) and B of his text:
Hayes, A. F. (2018): Introduction to mediation, moderation, and conditional process analysis: A regression-based approach. (2nd ed.). New York, NY: Guilford Press.