@kainos - I have just re-installed this style (Exclusive Black 2.2.12) again on my localhost and xf 2.2.12 with zero problem(s). you have xf 2.2.12 >
I unpack the file contents to a folder, copy and paste files to correct location, install the add-on > then ready to add/install style xml
1. have you installed the add-on - first = [XTR] Style Properties 1.0.7
2. copy the folder xentr (with contents) to the styles folder?
3. add/import style xml
That's all I have done and works again 100%
hope this helps