Where do I install the OpenSSL library?
You will need to install it either in the mIRC folder (typically C:\Program Files\mIRC) or in the Windows System folder (typically C:\Windows\System32).
If you install it in the mIRC folder, OpenSSL will be usable only by mIRC.
If you install it in the Windows System folder, OpenSSL will be usable by all applications.
There is no way to specify the location yourself and/or to dynamically load them from mIRC