Real World Heightmap Data?

Hi,

Well I have been messing around with unity for years now, I just joined the community to ask for some help... a current project I have started I wanted to use real world Heightmap data for the map. I have found a couple on the forums here that explains how you can, but none have worked for me and seem outdated, Im wondering if i missed any more up to date ones, or if someone has found an easy way to do it. Anyone know anything? Any help would be nice.