@jyg hm so i just checked if i missed something and if it is actually common practice to share files on deken with group and global write permissions. But that doesn't seem to be the case, here is a part of zipinfo output of else-v1.0-0_rc14 for example:

Is installing else causing trouble for you?
Could it be that you are having this problems because you are logged in as admin, not as user or you are trying to unpack these files to a protected folder or something like this?
If it helps i can re-upload the files with extra write permissions.