This group is intended to preserve the older versions of PGP and their respective texts.

I prefer PGP v. 2.6.3i (aka, 2.6.3ia) due to its simplicity of use, small size, and freedom to use without performing an actual installation.

Understandably, if you're worried about security in this modern, digital age I recommend keeping your thoughts to your self, speaking to no one, and turning off your computers and telephones. Seriously. I know a little something about these things. If the KGB or NSA are out to intercept your messages, don't worry, they already have every message you've sent, and every phone call you've ever made, on a hard drive somewhere and can peruse them at their leisure. In fact, the postal system is probably better suited for secure communications than is the internet. Encrypted message are snatched out of the ether and decrypted at an alarming rate.

PGP v. 2.6.3i isn't the most current version. I do not care; no version of PGP or GPG, IMO, will stand up to any national agency's decryption/hacking efforts. Knowing that, it's then a matter of usability and portability. PGP v. 2.6.3i excels in these areas, that's why it's my encryption software choice.