This morning (21st January) we'rel releasing a patch for EU4 called 1.29.4. As this patch will seemingly do nothing for you except change the version number and checksum we thought we should explain what’s going on.
We are running a few experiments aimed at reducing the threshold for new players to access the full EU4 experience. We are approaching this in a data-driven way, somewhat related to what we did in CK2 a few years back (and that test turned out great when it comes to growing the CK2 family around the globe!); which means that we cannot fully disclose how exactly it will look, as that will interfere with the test. What we can say is that it’s fully and completely optional and does not require you to interact with it in any way.
We hope that these experiments do not negatively impact your game experience, but, since updates have the potential to cause unforeseen effects, it is important that you know what is happening.
Tomorrow’s patch changes nothing that should affect mod compatibility. Mods that worked on 1.29.3 should work with no problems on 1.29.4. However, if a mod has specified 1.29.3 as it’s level of compatibility it will say it is outdated in the launcher, even if in reality it would work as normal. Hopefully your mods already have 1.29.* compatibility specified in which case there should be no effect whatsoever. If they are not though: it should be completely safe to run the mods anyway.