sharing folders using api

When you get a shareable link to a folder, instead of a file, you are expected to get a link /sh/ instead of /s/. When you use dl=1 on a shared link for a folder (/sh/) you should get a zip download of that folder.

Regarding the trouble you're having here, first, is this a sample of an actual link you're trying to us? When I try to access it, using either dl=0 or dl=1, I get a 404 error, e.g., meaning that there isn't anything at the path for the link anymore. If this is the actual link you're trying, that may be related to the issue you're seeing.

Regarding the error message you posted, "no valid 'aps-environment' entitlement string found for application", that isn't something that comes from Dropbox, but rather seems to be an Objective-C error message, e.g.:

https://stackoverflow.com/questions/13432203/no-valid-aps-environment-entitlement-string-found-for-application

If you're still having trouble with this, can you post your code and output?