You click the other button on the download page.

https://web.archive.org/web/19990911233949/http://www73.nets...

The US had some strange ideas about cryptography:

https://en.wikipedia.org/wiki/Crypto_Wars#PC_era

https://en.wikipedia.org/wiki/Export_of_cryptography_from_th...

https://en.wikipedia.org/wiki/Pretty_Good_Privacy#Criminal_i...