LDD part library missing
Here's an archive of the LDD part library for you to download, but I am not certain if it works. Give it a try.
Alternatively, if that link ever breaks down and you have Windows 10 you can right-click on your recycle bin, press open, then right-click on the library file pending deletion and press restore. It will come back.
P.S. If you doubt you will ever use this feature again, you can disable it by right-clicking recycle bin, clicking &quot;properties&quot;, and selecting &quot;Don't move files to the Recycle Bin. Remove files immediately when deleted&quot;.