Both of the new launchers give me the same error.
I've also noticed that when I download Blockland on windows, transfer all the files to Mac's blockland, the lower bar progresses about 10% and then a different error message comes up telling me that OS_X/Blockland is missing.
From that I can tell it is indeed something to do with file permissions or something like that, but I don't know what specifically to change as I've tried changing everything in the Blockland folder including the folder itself to all "read-and-write".
I have attached my launcher.log below.