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#039;ve been trying this and that through out the day, and I think the issue may boil down to improper installation... I think...
I noticed that I have more than one core.php file and a few other things in the pluginmanager package attempt to redefine other functions done by other files...
Was I correct in copying the extracted packaged (.tar.gz) files to the \root\mantis\ directory? I used 7zip to extract the files and below is the only file structure it provided.
..\pluginmanager-0.4.0\plugins
..\pluginmanager-0.4.0\plugins_file_package_page.php
..\pluginmanager-0.4.0\plugins_install_page.php
..\pluginmanager-0.4.0\plugins_list_page.php
..\pluginmanager-0.4.0\plugins_mantis_upgrade_page.php
..\pluginmanager-0.4.0\plugins_package_page.php
..\pluginmanager-0.4.0\plugins_page.php
..\pluginmanager-0.4.0\plugins_uninstall_page.php
..\pluginmanager-0.4.0\plugins_upgrade_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager
..\pluginmanager-0.4.0\plugins\pluginmanager\core
..\pluginmanager-0.4.0\plugins\pluginmanager\core.php
..\pluginmanager-0.4.0\plugins\pluginmanager\index.php
..\pluginmanager-0.4.0\plugins\pluginmanager\info.php
..\pluginmanager-0.4.0\plugins\pluginmanager\install_inc.php
..\pluginmanager-0.4.0\plugins\pluginmanager\install_manual_inc.php
..\pluginmanager-0.4.0\plugins\pluginmanager\lang
..\pluginmanager-0.4.0\plugins\pluginmanager\lang_inc.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_file_package_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_install_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_list_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_mantis_upgrade_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_package_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_uninstall_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\plugins_upgrade_page.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\backup_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\constant_inc.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\file_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\function_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\function_api.php~
..\pluginmanager-0.4.0\plugins\pluginmanager\core\install_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\plugin_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\core\xml_api.php
..\pluginmanager-0.4.0\plugins\pluginmanager\lang\strings_english.txt
..\pluginmanager-0.4.0\plugins\pluginmanager\lang\strings_french.txt
..\pluginmanager-0.4.0\plugins\pluginmanager\lang\strings_german.txt
..\pluginmanager-0.4.0\plugins\pluginmanager\lang\strings_russian.txt
Mantis: 1.1.8
PHP: 4.4.2-Win32
SQL: mysql-5.1.36-win32
OS: Windows 2000, SP4