I tried doing what you suggested. I put lines 1-72 from index.php in Library.php, single.php which are the template files of the plug in. But now I get the contents of the left sidebar without any styles AND the library content. The whole page looks unformatted.
I suspect it is because of
1. missing style sheet link somewhere
2. Also with the fact that 'Library' is not a 'Page' that I have created in Wordpress, but set as an option in Now-reading options for displaying the library.
These are only my guess. I cannot figure out what changed between the versions that show this behavior