You can now play with the previous version of Eu4 (v1.3.2) by right-clicking the game in the Games Library and selecting Properties and then the BETAS tab, the select the 1.3.2 version in the dropdown.



This can be handy if you want to finish an old save using the old rules or just want to compare features to before. Just be aware that this version is unsupported, your ironman saves will not be ironman and you can't play MP with people using another version.