Got it installed and running on my iMac.
I installed Winebottler which includes Wine as well. Launched Wine and installed Boinctasks to the Wine Program Files folder.
Made a new folder on my documents folder called boinctasks, launched Boinctasks, went to the extra menu and selected Boinctask settings. Went over to the expert tab, selected Overide default (xml) folder and then entered Y:\Documents\boinctasks\. Clicked Okay, went over to the computers tab and added 2 new ones and then entered the name, password and IP address.
Following your instructions,I got it installed too. THANKS
Now monitoring my 2 windows machines from the iMac.
I can not get it to see my PC. Still working on it.