There is no link to the libeay32.dll and ssleay32.dll on the http://www.openssl.org/ site. This site distributes the source code of the OpenSSL 0.9.7c libraries/toolkit. What you need is a compiled version of these sources. You either compile them yourself, of you have to find somebody who distributes a compiled set of files.

In this case, as suggested at the mIRC SSL page, you could try the pre-compiled files available from the Win32 OpenSSL Installation Project. Download the recommended Win32 OpenSSL v0.9.7c Installer. Succes!