I've seen many threads related to this, but these are all old and concern the 0.18 version of the demo. I checked on the KSP wiki and found out that the last demo version was 1.3.1, a fairly modern version of the game. However, it appears that it is no longer available. I have checked the current KSP website as well as older versions of the website on the wayback machine, and I have seen no hints of it. I have also checked steam and there was a KSP demo on it as recent as August 2018. Where did
Krakens, it's working for me!!
It may be because I bought KSP from Steam, and so I`m entitled to every KSP version available from them. Or perhaps because I already had downloaded it in 2018/Xmas and so I had a free license from that time.
I still can select these ones from the BETA Program:
In a way or another, it's a shame.
— — — POST EDIT — — —
It should be because I had "bought" it previously, from the times it was available...
Well