I can help you with that! http://www.99lib.net/book/search.php?type=tag&keyword=桐华 It should be the first entries at the link above. I used this site before for another book (锦云遮,陌上霜) and I noticed that the version on this site was more polished and with a bit more content than on other sites. So I concluded that, while most sites carry the first-draft "web version" of a specific novel, this site (99lib) very likely carries the final-draft "published version." eta: The site has copy-paste disabled. If you don't already have or don't want to install the necessary browser extension/plugin to circumvent that, I can copy the raw text of the untranslated chapters for you and share it on Google drive. Let me know.
No, thank *you* SO much! And I've added already your site to my ad blocker's "trusted sites" list eta: Umm, sorry for being a bit of a busybody... I think the first missing chapter is 43, then 45. Spoiler: that is Ch. 43 = Vol. 3, 第五章 天易老、恨难酬
Sure you can join in as and editor and post the chapters yourself if you want Busybodies are wonderful people