Re: Texture Pack [128x] Sphax PureBDcraft [(REAL)Technic 6.0.7 / Tekkit 2.1]
@prinsbart or anyone who is installing this texture pack on a Mac. Here is a video that hopefully solves your problem: http://www.youtube.com/watch?v=noC8FHjVHxc.
I was having the same issue with the grayed out texture pack, but was solved by opening, selecting all, and compressing the files within the Sphax PureDBCraft 128x folder (Note: this creates a zip file within the folder titled Archive.zip). The Archive.zip folder is what you put into your user/library/application support/techniclauncher/tekkit/texturepacks.
I hope this solves your problem.