Here's what worked for me to get smp folding.
•In the Terminal window you should see a prompt that looks something like this: yourusername@yourcomputername ~ $
•To download the 64 bit FAH client type in (or copy/paste) the following commands:
tar xzf FAH6.34-Linux64.tgz
Some guides don't show the enitre hyperlink and that was an issue in terminal. Copy that command in two parts. First the "curl -O", paste that and than copy and paste the hyperlink. This is a shortened version from the FAH site