I have just purchased a Tacx Flow smart T2240. Can you confirm if this will connect to my windows 7 PC if I purchase an ANT+ dongle?
The literature states this turbo supports the ANT+ FE-C protocol.
As it says here…
https://support.zwift.com/hc/en-us/articles/203152565-Which-trainers-does-Zwift-support-
Hi Lindsay - yep - pick up the handy Zwift ANT+ Starter Pack and you’ll be good to go 
The USB extension will ensure you avoid signal dropouts.
Look forward to seeing you out there.