'mandatory updates in these cases won't happen until late October'
This happened to me a week ago! Wouldnt let me log in unless i updated - which was a complete pain in the arse as the standard installer refuses to work with XP x64 even tho the software works perfectly fine on x64.
NOTE: anyone else with this issue should get the msi installer which does not have the OS check on it. Also you will need contacts.msi otherwise it will install but not log in