I reported a similar problem to Atik Support last week.
I could not get my Atik Horizon to work properly with Sharpcap having installed the required drivers. The problem was (for example) <gain> and other features were not connecting in SharpCap. Robin Glover (Sharpcap) suggested the issue was that it might have been accidently omitted from the latest ASCOM driver. Atik Support has acknowledged my report and promised to investigate. This was less than three working days ago.
I don't know, but it may be that the ASCOM drivers have been temporarily disabled from the core software download until this is issue is fixed to prevent others with older working drivers from running into any issues, hence limiting the problem only to new users of third party software. If my assumption is correct and Vince and Chris are on the case (as I am sure they will be) I guess that we might need a few days patience whilst this is resolved. My camera is working fine in the Interim with 'Infinity'. Bet you want to add 'darks on the fly" in Sharpcap? In the support acknowledgement it was mentioned that Atik is looking at that too.