To install Simple Gallery, upload the binary zip (Private Assembly) through host -> module definitions -> add new module.
I'm working on an install/configuration guide, but trying to get these enhancements out first.
Greetings,
Being new to DNN I had the same problem. Thanks for the tip on uploading it to the site. The DNN help file wasn't much use.
BTW: The actual text on the Host | Module Definitions page is "Upload New Module".
Regards,
kc