Latex editor

[Lautaro]

You won't be able to install that exact modification you're trying to use because it's for an older version of vBulletin. I suggest you to:

1.- Uninstall the product you imported.
2.- Delete all the files you uploaded to your forum's FTP.

Then try to search for a similar modification but make sure it's for vBulletin 4.x.x

if you don't find any, then you can open a paid request here:
https://vborg.vbsupport.ru/forumdisplay.php?f=30

maybe you get lucky and a coder can do this modification for you for a low price.

Good Luck !