Is there any plan to port this to vB 3.6.x?

hey, nice hack.

replaced my custom category hack with this one :)

i changed you installer a bit:
$db->query_write("ALTER TABLE " . TABLE_PREFIX . "thread ADD threadprefix varchar(100)");

to:
$db->query_write("ALTER TABLE " . TABLE_PREFIX . "thread ADD threadprefix varchar(100) NOT NULL DEFAULT ''");

could you include this change in your next version?

ERROR with 3.6.8
when I run category install.php ...here is the error I am getting.

Warning: require_once(.//categoryinstall_text.php) [function.require-once]: failed to open stream: No such file or directory in \admincp\categoryinstall.php on line 20

Fatal error: require_once() [function.require]: Failed opening required './/categoryinstall_text.php' (include_path='.;C:/Program Files/EasyPHP 2.0b1\php5\pear\') in C:\Program Files\EasyPHP 2.0b1\www\upload\admincp\categoryinstall.php on line 20

Can anyone please help me on fixing this below error.
I copied 2 files categoryinstall and categoryinstall_text in both upload folder and admincp folder. when i run in internet explorer. I am getting following error. What am I doing wrong? I noticed global.php exists in both folders.

Fatal error: Call to undefined function globalize() in C:\Program Files\EasyPHP 2.0b1\www\upload\admincp\categoryinstall.php on line 23

You really should use the version for 3.6.x, not this version which is designed for 3.0.x. :)
https://vborg.vbsupport.ru/showthread.php?t=123033

Thanks for the reply. I need thread category also because. I want the categories to come from database. Is this 3.6 thread prefix mod gets categories from DB. Looks like from your screen shots I am understanding that we have to manually enter the prefix in the form to show up in Thread prefix dropdown box.
Am I correct or we this latest version mod we can also get categories from database.
Please advice.
Thanks