I have just tried using the ORIGINAL version of HDR Efex Pro as supplied by NIK Software to me some 4 years ago.
Lo and behold it is now advising me that my thirty day trial has expired ... This happened yesterday.
I have contacted GOOGLE the giant in the sky to be advised that they have taken down the activation server and that this program will not run on MAC Os X 1-.8 or higher. I have used it under MAVERICKS (10.9).
Can any advise me of a work around.. or how to contact GOOGLE NIKCOlLECTION by phone to resolve.
Thanks