This is on my to-do list, especially as the 1.0.x series will only be supported by OpenSSL until 31st December 2019. From what I have read, the API in 1.1.x series has changed and there is no supported migration path. Considering that mIRC's SSL support is tightly integrated with 1.0.x and runs to about 4000 lines of code, this will likely require significant time and work. I am tempted to switch to Windows Schannel for SSL support to mitigate this type of issue in future - although Schannel does not have support for TLSv1.3 yet :-]