For the first error (`GLIBCXX_3.4.21' not found) try the other Linux version (the one marked as GCC 4.9.3). This was the reason I uploaded it.

For the second error (at least on Ubuntu 14.04) it seems that some dependency is missing but ldd doesn't report it. Under Ubuntu 14.04 ldd maps /lib/ld-linux-x86-64.so.2 to /lib64/ld-linux-x86-64.so.2 but when you try loading the executable this doesn't happen. If this is the case for you, try creating a symlink:

ln -s /lib64/ld-linux-x86-64.so.2 /lib/ld-linux-x86-64.so.2

Hope that helps.