It sounds like you have been trying to just muck around changing files... And may have just overwritten files which are part of this plugin (or Zen Cart) with copies from different versions. This will get you into trouble. Zen Cart is not just files - it is files + a database. Both the database and files need to be in sync for everything to work correctly - and this applies to plugins as well. In the long run thinking you can just "change files" and ignoring the database will lead to a large number of potential issues. You need to take both into consideration.

You should also NOT just start editing files which are part of the plugin to TRY to change stuff in the database. This can break the plugin and installer. Modifying things without knowing the ramifications can be disastrous. If you need to alter the database (and understand the ramifications of every change you make) you should directly edit the database using a tool such as phpMyAdmin.

It also sounds like you may have some invalid configuration settings for this module (possibly from mixing versions, changes you made to the installer, or changes made from the admin interface). The best long term solution is to completely remove this plugin and re-install.

Quote Originally Posted by tech-ebooks View Post
... when i use the older version of SEO URL,it working ...
First and foremost, did you install "Ultimate (SEO) URLs"? or some other "SEO URL" add-on. I ask because when people try to shorten the name of an add-on... Well lets just say there are at least three different add-ons which modify the URLs generated by Zen Cart people incorrectly refer to as "SEO URL".

Quote Originally Posted by tech-ebooks View Post
... which file i could modify to eliminate this problem? ...
Start by reverting your site to "known good" backup (files and database). Now verify you can get into the admin and also view the site. You should be able to unless there were problems which existed prior to attempting to install this plugin.

If for some reason you did not follow the instructions to make a backup of the files and database for Zen Cart... You will need to find and remove all files and database changes made by ALL versions of this plugin (and any added by changes you made to the installer). As you have been copying files from various versions (and probably breaking some of the upgrade scripts) you may need to do this by HAND.

Once everything is back to a VERIFIED working status (with ALL traces of this plugin removed)... Follow the instructions to install this plugin again. Do NOT take any shortcuts. Do NOT skip anything. Note any and all installation messages...