I can confirm the noobs lab ppa does not install the theme fully. Elements of it can, however, be installed via the various customisability tabs.
However, Danny, you must understand that the linux world does not work like the MS world. That is to say, if Microsoft undertake a new feature, they work on it till it is more or less bombproof in terms of installation and operation. which is, of course, very nice. However, the not so nice price you pay for the above is a significant lack of cutomisabilty via Microsoft’s suffocating embrace, serious privacy issues and, finally, financial cost.
On the other hand, Linux operating systems are generally wide open and so are extremely customisable. Though, If you want stable, then only use tried and tested themes and programs and you will, consequently, get a very predictable user experience. On the other hand, if you want a bit more excitement, then install bleeding edge stuff like the brand new Windows 10 theme. But, don’t be surprised if you have to do a bit of tweaking to get things to work exactly as you want.
My experience of installing themes in UM is that they should support GTK2 and also ideally state that they are tried and tested in a Mate environment
A good place to start would be: