Installations of DirSync has pre-reqs:
Install Online Services Sign-In Assistant (beta)
Install Windows Azure PowerShell Cmdlets
Today I installed DirSync for a new customer and as allways I installed the pre-reqs before starting DirSync Installation.
It ended in Error, Online Services Sign-In Assistant could not be installed, because a previous version is allready installed.
I knew there was a problem with the RTM Sign-In Assistant, but the Beta worked. So my first thougth was they fixed it and included it in a new realese of DirSync 🙂
The little things in life that matter!