Click on the "forum" link on the top of the page, then scroll all the way down and you'll see a graph of the number of posts per day. Most questions are answered by other members of the forum in their free time. You aren't guaranteed an answer, but in general most questions are answered within a day or two? There are also stickied topics in most of the sections with guidelines on how to make your questions easier for someone to help with.
The install issue you posted probably will be looked at by Scirra's staff after their work week starts. If the file is messed up on scirra's server, it will likely be fixed quickly.