put sculla.py in plugin dir and load via plugin menu and find it after under debugger menu.
Also important that you have environment setting called IDADIR = path /to /dir Always have this with ida anyway.
updated git. added support for both version so x86 loads scylla x86, and x64 loads the x64 one https://github.com/techbliss/SCyllaDumper again thx to the authers of the tool. This is simple plugin to load the real plugin.