hotfix · March 19, 2026

Stellaris Hotfix 4.3.1 Prevents Incompatible Save Loading

Stellaris hotfix 4.3.1 stops the launcher's Resume button from loading incompatible pre-4.3 saves and restores the Avian portrait for Paradox Account logins. The update also fixes a crash-to-desktop issue related to modifier names.

Paradox Interactive has deployed the 4.3.1 hotfix for Stellaris on Steam and GOG, with the MS Store version arriving soon under checksum f646.

Launcher and Save Compatibility

The Resume button on the launcher will no longer attempt to load incompatible saves, redirecting players to the Main Menu instead to prevent save corruption. Additionally, save compatibility UI has been updated to display the incompatible save icon for all pre-4.3 save files.

Bug Fixes and Stability

The Avian portrait granted by logging into a Paradox Account is now available again. On the stability front, the hotfix resolves a data corruption issue within modifier name generation that triggered crashes during out-of-sync log generation.

Why this patch matters

Hotfix 4.3.1 provides a safeguard for save files while addressing portrait and crash bugs introduced in the recent update.