Best way to Upgrade wamp 2.0 to 2.5

Usually I follow following steps to do it easily.

1. Stop Wamp Service
2. Rename the wamp folder to wamp-backup
3. Download latest version of wamp and install it
4. Rename the data folder of mysql with some different name (C:\wamp\bin\mysql\mysql5.5.20)
5. copy data folder of mysql from wamp-backup and paste it to new install wamp mysql folder (C:\wamp\bin\mysql\mysql5.5.20)
6. Rename new httpd-vhosts.conf file to httpd-vhosts-backup.conf.
7. Copy old httpd-vhosts.conf and paste to new installed wamp (C:\wamp\bin\apache\Apache2.2.21\conf\extra)
8. In apache 2.4, the directive Allow was dropped in favor of new directive Require. So change the settings from Order Deny,Allow Deny from all Allow from all to Require all granted

From

Order Deny,Allow
Deny from all
Allow from all

to

Require all granted

9.The old www folder in wamp needs to be copied into the new one. Let me know whether it's working or not.

you should do this , I recently updated it , first of all I took my Wamp directory back, then uninstall Wamp not remove the www directory , After that install the latest wamp on the same location , after this copy the folder named data inside the old wamp bin\mysql\mysql5.5.24 and paste that folder inside your new wamp on the same location then run your projects after starting the wamp services.

Note: folder version of db may be different and also latest wamp is based on virtual host so create v hosts also

Thanks