Download the patches (first download X30 and then download X31) from this thread, and save them somewhere you can remember them:
http://www.lfsforum.net/showthread.php?t=34749
Go to where you saved the patch and open the patch by double clicking on it and then click the "..." button and point it at where you have LFS installed. Then click "Extract". If it askes you to comfirm file replace, click "Yes to all". Done.
Repeat for each patch, in order. Once done you have the patches installed and you can delete the patch files themselves you downloaded. When you start LFS you will need to unlock it again.
Do not download the dedicated patch - you do not need this unless you are hosting a game using the dedicated server.