Powering a Sonoff Touch from mains
It is not possible to install this product without a neutral wire.

First of all, the word "way" in switch terminology means something specific, and in your question I believe you refer to wires coming into the wall box.

What you require is a neutral wire, a live wire (line), and the continuation of that live wire up to the light(s) (load), which is what we're switching. To purely switch the lights on and off, you would only need the live and load wires, but because the Sonoff is an electrical device, it needs the neutral wire to draw power for its internals.

Despite the confusion over wiring standards and colour codes, this Reddit post culminates in the conclusion that it doesn't work in the absence of a neutral wire: https://www.reddit.com/r/homeautomation/comments/7l19a3/will_a_sonoff_touch_duel_gang_switch_work_with_my/