Thanks for the report, this has been reported as bug #755641 and is scheduled for an Stable Release Update. In the meantime, you can delete /var/cache/sandboxgamemaker and try again. That should fix it, and you won't lose anything (that's just the temporary directory during downloads.)
Thanks for the report, this has been reported as bug #755641 and is scheduled for an Stable Release Update. In the meantime, you can delete /var/cache/ sandboxgamemake r and try again. That should fix it, and you won't lose anything (that's just the temporary directory during downloads.)
More info is at bug #755641.