This help article says the Asset Library can be accessed from Author Resources on the dashboard.
There is only an “Asset Resources” link on the dashboard and it goes here: https://help.market.envato.com/hc/en-us/articles/203039194
I guess the old Asset Library has been removed? Anyone know?
( the old asset library page was here: http://themeforest.net/page/asset_library and only worked when logged in )