I just posted BiblioCraft v2.0.1 on the downloads page and up on curseforge. This update fixed custom paintings being inverted along the horizontal axis and fixes a couple of crashes. One crash occured when trying to use spongeforge due to me incorrectly registering my custom enchantments. That has been addressed. Another random crash has been occurring for me and a number of folks that I think I finally got taken care of. It was a rendering crash relating to how I was loading models with block states. I am pretty confident I have this crash solved now.
Head on over to the downloads page to grab the newest copy and if you have any comments, questions, or issues, feel free to post on my website, on the official Minecraft forum or create an issue on my GitHub. Enjoy!