@Raymond @Factor
I cannot confirm this. As well as you can make Transformer (if fully adapted to PHP 7) run smoothly with Prestashop 1.5.6x and 1.6.1x (both either with PHP 5.6, 7.0, 7.1, 7.2, 7.3 [only PS 1.5.6]), you can use it perfectly with TB 1.08, and even with 1.1.0. But the latter needs some minor CSS improvements both in product view, list views and checkout.
As I pointed out in my first post The creator of the theme states its not fully compatible. That is good enough for me..
Like @colorful-ant said as well.