FunScript is in the middle of a restructuring/reorganization process[1]. Hopefully FunScript will find its legs and start moving forward sometime soon.

Intellifactory's Websharper projects are well supported and regularly updated, you could try Websharper.Warp[2] in lieu of FunScript.

[1] https://github.com/ZachBray/FunScript/issues/185

[2] https://github.com/intellifactory/websharper.warp