Attempting to run the linux executable (snapshot 1w16) on EndeavourOS (Arch Linux) results in this output and fails to launch the game.
me@my-computer $ ./Solar\ Sandbox.x86_64
ERROR: The MD5 sum of the decrypted file does not match the expected value. It could be that the file is corrupt, or that the provided decryption key is invalid.
at: open_and_parse (core/io/file_access_encrypted.cpp:113)
ERROR: Can't open encrypted pack directory.
at: try_open_pack (core/io/file_access_pack.cpp:304)
Error: Couldn't load project data at path ".". Is the .pck file missing?
If you've renamed the executable, the associated .pck file should also be renamed to match the executable's name (without the extension).
So… missing some other files?