Something is wrong with the linux version of the demo and test. .86_64 is not a valid file extension. I tried renaming it to .zip and it wanted to extract but only pulled out one file. While looking in the archive , I did not see any .sh file which is the linux executable file. I hope that you can get it fixed for linux because it's unplayable as is. Thanks !
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.86_64 files are usually 64 bit binary executables. Your browser probably just didn't flag it as executable after downloading. In your file manager if you go to the properties of the file there's probably a setting somewhere to mark it as executable. Once set to exectuable you should be able to run in.