Please always use our main website to retrieve any binaries; please never use mirrors directly. We have some advanced tech that makes sure you end up at the right location depending on your request. Example URL to use:https://www.openttd.org/en/download-stable/0.4.8
This archive goes back a very long time. In fact, it contains all releases we ever released.
Binaries from the nightlies are cleaned up from time to time; sources are archived for ever and ever too.
Depending on load, requests, space available, and a few more factors (geolocation, amount of mirrors that already replicate the binary, demand for that binary, ..), mirrors are loaded with different binaries. This might or might not have the version you want. Never depend on a mirror. Always use the URL above
And you never wonder again!