It launched now, but I get this:
LaunchProcess: failed to execvp:
/home/USER/Documents/Tools/Crocotile3D_v1.9.5_linux64/nacl_helper
[459029:459029:0807/080215.889870:ERROR:nacl_fork_delegate_linux.cc(329)] Bad NaCl helper startup ack (0 bytes)
[459026:459035:0807/080217.489888:ERROR:nacl_browser.cc(290)] Failed to open NaCl IRT file "/home/cass/Documents/Tools/Crocotile3D_v1.9.5_linux64/nacl_irt_x86_64.nexe": -4
[459059:459074:0807/080218.887213:ERROR:cert_verify_proc_builtin.cc(559)] No net_fetcher for performing AIA chasing.
[459059:459072:0807/080218.887543:ERROR:cert_verify_proc_builtin.cc(559)] No net_fetcher for performing AIA chasing.
[S_API] SteamAPI_Init(): Loaded '/home/cass/.steam/debian-installation/linux64/steamclient.so' OK.
[S_API FAIL] SteamAPI_Init() failed; connect to global user failed.[459059:459075:0807/080317.619037:ERROR:cert_verify_proc_builtin.cc(559)] No net_fetcher for performing AIA chasing.