Cities: Skylines II Patch 1.6.4f1 Adds the Grand Post Office and Mod Updates

Seasonal Shift brings the latest Open Beta improvements to the live game and lays groundwork for the upcoming Park Adventures DLC.

Bojan Kicevski1 minute ago

0 2 2 minutes read

Seasonal Shift 1.6.4f1 patch graphic over a dark blue map background for Cities: Skylines II.

Patch 1.6.4f1, titled Seasonal Shift, brings the latest Open Beta improvements to the live version of Cities: Skylines II. It also fixes a performance problem caused by cities accumulating companies without buildings, restores the Hydroelectric Power Plant, and adds the Grand Post Office as a new signature building.

Players can unlock the Grand Post Office by subscribing to the Paradox Newsletter. Colossal Order describes the update as groundwork for the upcoming Park Adventures DLC in its Steam announcement for Patch 1.6.4f1.

Paradox Mods gets new ways to follow creators and manage playsets. Players can browse a dedicated followed-creators tab, see featured mods from creators they follow, and set subscribed playsets to follow their latest version. Logged-out users can also manage their Playsets and Library, while mod visibility is now controlled through the PDX Mods UI.

The graphics changes follow an October Steam beta for rendering and upscaler tests, which covered updated building LOD models and several upscalers. Seasonal Shift names DLSS 4.5, FSR 3, and XeSS 3 among its changes, along with an updated benchmark save.

Cities: Skylines II 1.6.4f1 Seasonal Shift Patch Notes

Gameplay

Fixed cities building up too many companies with no buildings, causing performance issues.
Fixed the Hydroelectric Power Plant not functioning.

UI

Updated Coherent UI framework.
Fixed the game mode image flickering when hovered in the menu.
Added missing translations for Downtown Market Set.

Visual

Fixed trees with growth turned off continuing to grow.

Misc

Upscalers:
- DLSS 4.5
- FSR 3
- XeSS 3
Updated the benchmark save.

Editor

Fixed missing screenshots when updating an asset mod.
Removed Visibility field from the asset upload panel. Mods are now hidden by default and visibility can be changed from PDX Mods UI.

Modding Template

Removed Visibility support from Publish Configuration. Mods are now hidden by default and visibility can be changed from PDX Mods UI.

Paradox Mods

Added a ‘By followed creators’ tab for browsing mods
Added a featured section with the latest mods from followed creators
Added a badge on the avatar of creators you follow
Added a ‘Follow latest playset version’ setting to subscribed playsets
Added the option to change a mod’s visibility directly from the PDX Mods UI
Logged-out players can now open and manage their Playsets and Library
Creators’ shared playsets can now be viewed while logged out
Improved the design of the search, filter and tab components

Bug Fixes

Fixed mod content sometimes not loading on startup, typically when using the Continue option from the launcher.
Fixed rare cases of Mods UI not loading correctly on startup
Fixed playsets sometimes not loading on startup
Fixed subscribing to a shared playset opening the wrong version
Fixed shared playsets from other players showing the wrong version
Fixed managing playsets while logged out
Fixed an endless loading loop on a creator’s shared playsets
Fixed an error when removing a mod from the Library while offline
Fixed subscribed mods missing from the playset if their download failed
Fixed some downloads not being tracked when subscribing to several mods
Fixed a crash in the DLC dependency wizard while offline
Fixed the follower count not updating on follow and unfollow
Fixed special characters in forum comments not being escaped

Which Seasonal Shift change would you notice first in your city? Follow us for more on the Park Adventures groundwork and the game’s ongoing updates through X, Bluesky, YouTube, Instagram, Steam, and Telegram.

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