Paul, you got good advice on returning the Packs that are missing. However, for your registrations to work properly, you need to install Packs in the same order as before deleting. This is determined by the LSB position.
This is not mentioned in the video, and it is very important when you have install more than one Pack.

[video:youtube]https://youtu.be/PmqB_FtxapQ?t=115[/video]