You can download your previous purchases at any time from the Store. If products are updated, you can also get any additional updates or added products by using the same process. Here's what to do.
1. Go to the Store
2. Go to the My Account page and log in if you're not already logged in.
3. Click on the Downloads link
This will give you a list of any products that you have previously purchased. Any additional files or updates will be available here also.