Changelog.ggBeta
HomeGamesUpdatesPricingMethodology
Steam News1 June 20261mo ago

Hotfix - Patch 1.5.10f1

This patch should not affect mods, and loading of old savegames is supported. After our previous patch, we received a lot of reports about being unable to save, or receiving ‘NotSupportedException’ error.

In this update1

Full notes

Full Cities: Skylines II update

Read the full published notes in a cleaner layout. The original post stays linked below.

What changed

3 fixes0 additions1 change0 removals
  • Compatibility
  • Fixes
  • Maps
changedAfter our previous patch, we received a lot of reports about being unable to save, or receiving ‘NotSupportedException’ error. We want to thank everyone who participated in testing out the open beta branch that we released related to this issue!
fixedWe have prepared a hotfix that addresses the symptoms of this saving bug. Our research suggests that the actual issue was introduced by the addition of Asset Editor last year, but it stayed hidden until our recent change. We are still looking into the root cause of this issue and plan to release a complete fix for the bug in our next patch! However, in the meantime, the current fix should be enough to keep your game going and saves functioning.
fixedMisc:Fixed issue with saving old save games.
fixedMisc:Fixed issue with saving custom maps.

This patch should not affect mods, and loading of old savegames is supported.

After our previous patch, we received a lot of reports about being unable to save, or receiving ‘NotSupportedException’ error. We want to thank everyone who participated in testing out the open beta branch that we released related to this issue!

We have prepared a hotfix that addresses the symptoms of this saving bug. Our research suggests that the actual issue was introduced by the addition of Asset Editor last year, but it stayed hidden until our recent change. We are still looking into the root cause of this issue and plan to release a complete fix for the bug in our next patch! However, in the meantime, the current fix should be enough to keep your game going and saves functioning.

Misc:

  • Fixed issue with saving old save games.

  • Fixed issue with saving custom maps.

Source

Steam News / 1 June 2026

Open original post

Changelog.gg summarizes and formats this update. How we read updates.