[Plugin: Improved Plugin Installation] [plugin bug] with “improved plugin installation” and WP 2.8

I recently installed the “improved plugin installation” plugin on WP 2.8.
And when trying to use it, I got the following error massage:

Fatal error: Call to undefined function do_plugin_install() in /home/*****/public_html/wp-content/plugins/improved-plugin-installation/improved-plugin-installation.php on line 445

Any ideas?

Tal

https://www.ads-software.com/extend/plugins/improved-plugin-installation/