I've tried something a bit different and used the AMOSPro_Community_2020_1.adf, copying AMOSPro_Compiler_Config and AMOSPro_Interpreter_Config to S: and amos.library to libs: then copied the disk contents into Programs:
From there, I can launch AmosPro, but I get the Insert volume "AMOSPro_Accessories" in any drive error. And annoyingly, that version doesn't come with the help files. So I copied the AGS version of AMOS Pro's in there, then assigned AMOSPro_Accessories: to the same directory as AmosPro.
And that seemed to have worked. But I guess just copying the whole lot from AGS and doing assigns would also work.