It's telling you it has dependencies on the extensions: Rogue System Detection 2.0.2 and ePO Core 1.0.3
An upgrade to ePO 4.5 replaces Rogue System Detection 2.0.2 with Rogue System Detection 4.5
It's possible the ePO Core extension has changed too.
So basically it's unknown because the dependencies are no longer valid.
My guess is you probably need an upgrade to the Foundstone extension, or if you are not using Foundstone then remove it.
We're running Foundstone 6.7 and it's not "supported" with ePO 4.5, we're planning to upgrade Foundstone 6.8 or 7.0 which is supported with ePO 4.5.