

An alternative is plain old school irc. I’m not kidding.
Connect to irc.irchighway.net then /j #ebooks then !search <author and/or title>
Receive search results via xdcc which gives you the commands to download that stuff.
Or query one of the bots (e. g. @bsk) and get a list of hundreds of thousands of books that are available and search that for what you want.
I prefer that over ad infested one click hosters with countdowns, link shortener cascades and captchas. I find and get the stuff much faster by using irc.
I’m not sure if #ebooks mirrors Libgen. I wouldn’t be surprised if they copy from each other.
I have allergies against ads, countdowns, etc. The interweb is polluted with that stuff and so are most piracy sites.
I find irc to be much easier to use than the alternatives. Just a click to start hexchat and then it auto-connects to the right server and auto-joins the right channel. All within seconds. I even get my animes from irc like I did in 2005. 😁