Hi mj2000,

1) Yes, The definitions updates will be same for all the avast! versions. But it is recommented to download the VPS definitions  from http://www.avast.com/download-update link and run in other computers to update avast! there.

2) No, In Setup folder there will be updates related with avast! components. So the setup folder wont be same for free, pro and security avast! versions.