I am reinstalling CiviCRM on Wordpress after Civi quit quit working. I deleted the folder civicrm in /plugins and also in /uploads. This allowed me to upload the new plugin version of Civi and took me to the CiviCRM Installer. However, I get this message "CiviCRM data from previous installation exists in 'database_april'" which is the name of the database from my previous installation. How can I get the Installer to allow connection to the prior database? Thanks for your help!
You'll need to use mysql or phpmyadmin or equivalent to run sql/civicrm_drop.mysql. You may also need to manually remove the civicrm_install_canary table.
What it's technically complaining about is that you still have data in the civicrm_contact table.
UPDATE for more instructions using phpmyadmin: On the Import tab browse for the sql/civicrm_drop.mysql file and then click the Go button. You won't be able to browse on the server, so you'll need a copy of the civi download unzipped on your machine to browse for it.
To drop civicrm_install_canary, go to the SQL tab and enter
DROP TABLE civicrm_install_canary and click Go.