"update not properly signed".
I then downloaded manually 1.7.2 but are not able to install manually from downloaded package; I open "Wine-1.7.20/tools/wineinstall" like it says in the instructions,
and Terminal gives the message:
"You're running this from the wrong directory. Change to the Wine source's main directory and try again."
but I think that's what I'm doing.
I'm not good enough at this to figure out a solution myself...

Am I mistaken here and overlooking something obvious?