I would have tried to have snoopdos running and pay pattention to what goes on. The AmiSSL installer attempts to maintain a heck lot of certificate files (ca certs) which (depending on disk, filesystem etc) can take quite some time. There is no disk activity when it “freezes”?
(And it would be really nice if AmiSSL distribution could be split into seperate lha files for the different platforms, the whole package is ridiculously large to download an unpack on lower spec/connected systems)