The official Steam version is the best choice. It's completely safe, works seamlessly on a wide range of distributions, and gives you automatic access to the latest updates and a vibrant online community. It costs money, but during sales, you can often get the game for a substantial discount. This is the method that supports the platform and the developers.
Access to day-one patches, bug fixes, and balance updates. Sid-Meiers-Civilization-VII-Linux-Razor1911.zip
It highlights that developers cannot treat Linux versions as an afterthought, relying on the assumption that pirates only target Windows. The official Steam version is the best choice