AmiSSL v4 for OS3 and OS4 has now been released and is available for download from https://github.com/jens-maus/amissl/releases. However, please not that IBrowse 2.4 will not be able to make use of this, but you should install it over AmiSSL v3 anyway, as applications will start to be released that use it (YAM, for example). IBrowse 2.5 (when released) will require AmiSSL v4, and has been adapted to use it some months ago.