Jasco/GE Dimmer require a 3 wire?

Yes, check the user manual. That model requires a neutral. The neutral is used to power the switch so that it can hear the next “on” command from the network even if the switch appears to be off.

There are some options for your switchboxes that don’t have a neutral. You can have an electrician “fish up” a neutral from elsewhere on the circuit and that will give you the most options.

Alternatively, see the following: