Cities Skylines II Ultimate Edition v1 5 4 F1

Troubleshoot For Games
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Sacred5010
Posts: 3
Joined: 22 Feb 2026, 21:12

Latest version fails to launch, installed with/without low resource mode. Installed in boot drive and secondary SSD, same result.

Windows 11
RTX 3060ti
Ryzen 7 3700x
32GB RAM

Content integrity check failed
System.Security.Cryptography.CryptographicException:
Bad PKCS7 padding. Invalid length 0

Image
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KiNG
Posts: 5150
Joined: 23 Jun 2012, 15:41

do you have windows file compression enabled?
it seems to be an issue on windows not really the game fault
``` Go to the folder where the game is installed
Right-click > Properties > Advanced…
Uncheck: “Compress contents to save disk space”
Apply to all files and folders
Then reinstall the game```
is is ment to fix it
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Sacred5010
Posts: 3
Joined: 22 Feb 2026, 21:12

KiNG wrote: 23 Feb 2026, 11:14 do you have windows file compression enabled?
it seems to be an issue on windows not really the game fault
``` Go to the folder where the game is installed
Right-click > Properties > Advanced…
Uncheck: “Compress contents to save disk space”
Apply to all files and folders
Then reinstall the game```
is is ment to fix it
This does not work sadly

The folders were already unchecked
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KiNG
Posts: 5150
Joined: 23 Jun 2012, 15:41

theres multiple posts about it on the steam pages so its a known issue, just have to wait for an update from the devs.
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KaOs Game Index | Repack Issues | Broken Links | Youtube | Discord
KaOs New Releases
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