Afantin, As georgec says, its on Release To Support only at the moment, so customers that are having problems with previous versions, or maybe need it for ePO 4.6 can contact support and get it. After a while it will go RTW(release to world) for everyone to download.
I received mail about EPO 4.6 and compatibility with host DLP
What are the new features introduced with this version of McAfee Host Data Loss Prevention?
NOTE: This is only a subset of the major features.
i received an SNS notification that DLP 9.1.100 is now released. This reports that its compatable with epo4.6 and epo4.5 patch 2 and above.
So can get this installed and then upgrade to ePO 4.6 without as many issues.