i just update my k2 and now i am having k2 V.2.6.7. And i am using Joomla! 2.5.4. after i update users cant register.it will give 404 - Component not found error. registration page is seems to be working fine with recapture.after user click the register button error occur.

index.php/component/users/
404 - Component not found
You may not be able to visit this page because of:

an out-of-date bookmark/favourite
a search engine that has an out-of-date listing for this site
a mistyped address
you have no access to this page
The requested resource was not found.
An error has occurred while processing your request.
Please try one of the following pages:

Home Page
If difficulties persist, please contact the System Administrator of this site and report the error below..

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My configurations
SEO Settings yes
Search Engine Friendly URLs No
Use URL rewriting No
Adds Suffix to URL No
Unicode Aliases No
Include Site Name in Page Titles no

Gzip Page Compression yes

can anyone help me with this :huh:

Since you have upgraded from version 2.5.4 your overrides might be old.
You need to compare the file register.php between the component (components/com_k2/templates/) and your overrides (templates/your_template/html/com_k2/) and update with the latest one's changes.