I'm trying to download amdgpu-pro-17.50-511655.tar.xz and it doesn't want to work, I have xz-utils installed. It also will not decompress using 7zip under windows 10. I downloaded the file several times under both Linux and Windows. I would also like to know where I can download 17.40 (I'm trying to get openCL working under Gentoo).
nanoox ~ # tar xvJpf amdgpu-pro-17.50-511655.tar.xz
xz: (stdin): File format not recognized
tar: Child returned status 1
tar: Error is not recoverable: exiting now
nanoox ~ # xz --decompress amdgpu-pro-17.50-511655.tar.xz
xz: amdgpu-pro-17.50-511655.tar.xz: File format not recognized
nanoox ~ # ls amdgpu-pro-17.50-511655.tar.xz -lsa
267024 -rw-r--r-- 1 root root 273431691 Dec 15 13:19 amdgpu-pro-17.50-511655.tar.xz
nanoox ~ # md5sum amdgpu-pro-17.50-511655.tar.xz
5fa0a5711081be53e290186c3c75414f amdgpu-pro-17.50-511655.tar.xz
I had a similar problem last night. I ended up running a wget to pull the file down and then it decompressed successfully with a tar -Jxvf. Oddly enough I tried downloading it again after the steps above and that time it worked. No hard evidence to explain why though.
The 17.40 link is still up. If you google “AMDGPU-PRO 17.40” it should be one of the first few results.
Hope this helps!