This will upgrade your WSN Links database info to the latest version... it will not harm any existing data.
Note that this upgrade can safely be re-run as many times as you want. If something seems to have not gone right, you can always run the upgrade again and it will not damage anything.
The following queries will need to be performed to add new fields (if the textbox below is empty, none need to be run). 95% of people can ignore this, as the upgrade script will run the queries automatically; however, this process can be very slow on very large database tables. If you have a very large database and the upgrade stalls, you may want/need to do these queries one by one through phpmyadmin giving them their necessary minutes/hours to execute, and then come back to run the upgrade again once you've run them all. Just try the upgrade, the normal way, then come back to look here if you can't get it to finish.