In the late 1980s, Radio Belgrade 202 was sending software over radio for download.
Back in the 80s, devices such as C64, the ZX Spectrum, and the Yugoslav self-built Galaksija were using cassette tapes for storing data and programs.
In Yugoslavia, there was a radio program that would play such a cassette on air, people would record it at home with a cassette, and then they would have a new game or other program that they could load into their computer.