Get the most recent version of those package from here:
https://www.mobileread.com/forums/sho...d.php?t=225030
Just re-install the packages, you do not have to un-install the old ones.
If you don't find something in that list, the version you have already installed is probably "good enough".
Post back here with what you have done.
And the librariansync directory is a sub-directory of /extensions not of /documents.
Please include a link to the set of directions you are following.
That will help us to find where the errors are in what you where told to do.