Oh, that is curious. Are you running from an Ubuntu-based distro?
I was running from an Ubuntu-based distro (Linux Mint) and I had this problem. My workaround was just downloading the browser version. Someone in the comments below linked the downloads to libcrypto and libssl but it told me I had the wrong ELFCLASS still.
Thanks everyone for reporting this! To properly fix it, I'll probably need to update the game engine to the latest version. It could still take some time before I get around to properly fixing this issue, but I'll look into this sooner or later (and like you noted, you can use the browser version as well).