[Live-demo] Grass script failure

[Alex Mandel]

I'm running the scripts now on a fresh VIM and got:
Package wish is a virtual package provided by:
  kt8.3 8.3.5-14
  tk8.5 8.5.6-3
  tk8.4 8.4.19-2
You should explicitly select one to install.
E: Package wish has no installation candidate
ERROR: Package install failed! Aborting.

I'm not sure which to pick, Hamish can you resolve that?

Thanks,
Alex