I would like to report a missing step in the procedure described in the wiki article Dual Upgrade of OpenEMR and XAMPP in Windows.
After point 2 of the “Importing old data” section, I think the following instructions should be added:
And, ensure you copy your settings from the following old openemr
files to the new configuration files (we do not recommend simply
copying the entire files):
openemr/sites/default/sqlconf.php
--Also in this sqlconf.php file, set the $config variable (found near bottom
of file within bunch of slashes) to 1 ($config = 1;)
openemr/sites/default/config.php
These instructions are taken from section V of this document.
Also, if you do not run setup.php, you should manually create the openemr database and the MySQL user specified in sqlconf.php, granting that user full privileges on the database. Otherwise, importing the dump file will fail, and accessing http://localhost/openemr/sql_upgrade.php will display the misleading error message:
Check that mysqld is running.