Unable to download using zlib

[sew3521]

On my newer Paperwhite I am able to use this script without issue. On my older Paperwhite (Kindle Paperwhite 6th generation running 5.12.2.2) it will not work though. I keep getting the error

Processing with zlib...Failed to get download link from Z-Library response.
["success":0,"error":"Please login"}
Download from zlib failed.

It seems like I am logging in correctly because when I log in it says
Successfully logged in as <Username>!

I apologize in advance if this is something I am doing wrong. TIA

[applegry2-cell]

have the same

[Govanator12]

I have a similar issue. Every download link gives me the error Failed to extract book info from URL: {URL} however I am successfully logged in