I am creating a map, I want the map to start with 1000 available population without needing to have houses, just like the scenario map of Europe. I saw in another forum that there is a research option called "Set Maximum Population" to be use in Trigger, but it happens that this research only exists in the HD version of the game, it doesn't exist in the normal game, which is where I want to create it, so I can't apply it. The "1000 pop" mod offered by Voobly doesn't work for me either, because my map will be with the "Long lasting resources" mod, so I can't use two mods at the same time. Help please! I saw that in several maps in normal game (not HD), it is played with 1000 pop and long resources. My map is ready, except for that issue that I don't know how to solve

You could create a custom scenario and build the required houses in the (protected) corners of the map. If you use tents, you will also be saving a lot of space.