1. I have added @Html.Widget to the menu to show All Shops, but only one shop is shown, even though I have two shops added. Is it because I'm using the trial version?
Yes, the trial version is limited to show only 1 shop.
2. I'd like to create own custom codes to search for the shops. Is there any simple documentation or tutorial for this? Such as function to get all shops from the database.
How exactly do you want to search for the shops?
In the current version of the plugin we don't have any search functionality. But if there is demand for searching the stores then we can consider implementing it. So it is up to you to provide us with more information of how you would like the search functionality to work.
3. Can I change any title/label in the admin area? Such as "Address" instead of "Short Description".
Yes, you can change it.This is the resource you need to change: SevenSpikes.StoreLocator.Admin.Shop.ShortDescription. The plugin is fully localizable, so you can change every single resource in the public and administration area. This video explains it well.
4. When does the holiday promotion 20% off end? I'd like to try if this works well for my project, and hopefully to purchase the plugin before the promotion ends. My main concern is to be able to search the shops.
The promotion ends on December 31st.