1.6.4f1|Nov 10, 2026
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Cities: Skylines II 1.6.4f1: Grand Post Office

3/5 Moderate

The Grand Post Office unlocks through the Paradox Newsletter, while fixes address city performance, the Hydroelectric Power Plant and mod loading.

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Key Changes

  • 1The new Grand Post Office signature building can be unlocked by subscribing to the Paradox Newsletter.
  • 2Cities no longer accumulate too many companies without buildings, which caused performance issues.
  • 3A startup issue that sometimes prevented mod content from loading has been fixed.
  • 4The Hydroelectric Power Plant has been fixed.
  • 5Logged-out players can now open and manage their Playsets and Library.
  • 6Subscribed playsets have a new setting to follow their latest version.
  • 7An offline crash in the DLC dependency wizard has been fixed.

All Changes

🏛️Signature Buildings(1)

  • newGrand Post Office: The new Grand Post Office signature building can be unlocked by subscribing to the Paradox Newsletter.

🏙️Gameplay(2)

  • fixFixed cities accumulating too many companies without buildings, causing performance issues.
  • fixHydroelectric Power Plant: Fixed the Hydroelectric Power Plant not functioning.

🖥️UI(3)

  • changeUpdated the Coherent UI framework.
  • fixFixed the game mode image flickering when hovered over in the menu.
  • fixDowntown Market Set: Added missing translations for Downtown Market Set.

🌳Visual(1)

  • fixFixed trees continuing to grow when growth was turned off.

🖼️Upscalers(1)

  • changeThe patch lists DLSS 4.5, FSR 3 and XeSS 3 under upscalers.

📊Benchmark(1)

  • changeUpdated the benchmark save.

🛠️Editor(2)

  • fixFixed missing screenshots when updating an asset mod.
  • removeRemoved the Visibility field from the asset upload panel; mods are hidden by default and visibility can be changed in the PDX Mods UI.

📦Modding Template(1)

  • removePublish Configuration: Removed Visibility support from Publish Configuration; mods are hidden by default and visibility can be changed in the PDX Mods UI.

🧩Paradox Mods(8)

  • newAdded a 'By followed creators' tab for browsing mods.
  • newAdded a featured section with the latest mods from followed creators.
  • newAdded a badge to the avatars of creators you follow.
  • newAdded a 'Follow latest playset version' setting to subscribed playsets.
  • newAdded the option to change a mod's visibility directly from the PDX Mods UI.
  • changeLogged-out players can now open and manage their Playsets and Library.
  • changeCreators' shared playsets can now be viewed while logged out.
  • changeImproved the design of search, filter and tab components.

🐛Bug Fixes(13)

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

Summary

Gameplay and buildings

The Grand Post Office is a new signature building unlocked by subscribing to the Paradox Newsletter. Fixes address excess companies without buildings, a non-functioning Hydroelectric Power Plant and trees growing when growth is disabled.

Paradox Mods and editor

Paradox Mods adds followed-creator browsing, a latest-playset-version setting and more access while logged out. Mods are hidden by default, with visibility controlled through the PDX Mods UI. Fixes cover startup loading, shared playset versions, downloads and an offline DLC dependency wizard crash.

Other changes

The patch lists DLSS 4.5, FSR 3 and XeSS 3 under upscalers, updates the benchmark save and Coherent UI framework, and fixes menu flickering and missing Downtown Market Set translations.