If you are running AppServ as a WAMP development environment on a Windows machine, you may experience difficulty installing cURL. Here are some helpful steps:

First go to the PHP directory and copy the following libraries to the windows/system32 dir.

ssleay32.dll

libeay32.dll

Open the php ini file and remove the ; from extension=php_curl.dll

Reboot your machine to load the dlls and restart apache.