User Registration Not Working

-- HikaShop version -- : HikaShop [1410251006]
-- Joomla version -- : 2.5.27
-- PHP version -- : 5.4.34
-- Browser(s) name and version -- : Chrome 39.0.2171.65
-- Error-message(debug-mod must be tuned on) -- : Fatal error: Call to undefined function hikashop_get() in /home4/accurbe2/public_html/plugins/system/hikashopregistrationredirect/hikashopregistrationredirect.php on line 43

When a user tries to create a new account they are brought to a blank page. I logged into the back end and enabled the system error reporting and get this:

Fatal error: Call to undefined function hikashop_get() in /home4/accurbe2/public_html/plugins/system/hikashopregistrationredirect/hikashopregistrationredirect.php on line 43

It's fixed in latest version .
Download Hikashop again and update it.
Don't forget to backup your site before update.

I cannot instal the latest version. Downloaded the zip and the tar.gz and it "cannot find the install file" I am running the 2.3.4 by the way which seems to be the latest version.

It was part of "silent update" of Hikashop 2.3.4.
Optionally you can replace file
\plugins\system\hikashopregistrationredirect\hikashopregistrationredirect.php
with file from installation package
\back\extensions\plg_system_hikashopregistrationredirect\hikashopregistrationredirect.php

or apply fix from topic I linked in previous post.

For installation problem, you can try to install Hikashop via FTP .