I suggest alfred support workflow auto download and auto update
details as follows,
* a config file, whose each item corresponding a workflow
* each item contains: download addr(github addr)、current version get addr(github addr)、etc.
* auto download, add a new item to the config file, then alfred auto download new workflow and install
* auto update, alfred workflow check for update everyday and auto update background
by this way, user could use workflow more conveniently.