Joomla 2.5.11
Downloaded the demo and installed it.
Install "succeded" but displayed various errors.
CJBog didn't work so tried to uninstall and start over.
Errors uninstalling. See below
How do I manually uninstall and start over?

========== Errors Begin ==========
Failed deleting articles.xml
Failed deleting badges.xml
Failed loading XML file
/home/compdoc/public_html/administrator/manifests/packages/pkg_pkg_cjblog.xml
XML: failed to load external entity "/home/compdoc/public_html/administrator/manifests/packages/pkg_pkg_cjblog.xml"
Package Uninstall: Missing manifest file
Failed deleting cjblog.xml
========== Errors End ==========