Can't Install Unreal on My MacBookAir M1 Error IS-IN-FC02

Development Getting Started & Setup
1

I imagine I am not the first one having this problem, I apologize, I could not find the topic.

I am desperately try to install Unreal on my MacBook Air (Sequoia 15.7.3, with XCode 26, about 100GB free on disk).

I tried 5.74, 5.4. , even 4… it always stop at some % saying installation failed with error IS-IN-FC02. I even tried via github and terminal (helped by AI), and it was a disaster.

I am quite frustrated, wanted to start learning Unreal, but this is not a nice welcome!

Is there some Mac usere who managed to overcome these problem and install Unreal?

Thank you in advance,

Zeto

2 Likes
2

Did you check out the official link for this kind of error? Try and grant the Epic Games Launcher full disk access under Privacy & Security settings.

3

I’m having the very same problem here, tried to grant full disk access, ran as an administrator etc. but the same error IS-IN-FC02 occured at 75% installation. Very Frustrating. I’m on Macbook Air M1 trying to learn UE.

4

Getting this same error, installing unreal 5.7 from the launcher on a macbook neo. The official link does not help, setting full disk access does not help, google generated ai answers do not help (various chmods and mkdirs).

5

tail -n 200 ~/Library/Logs/Unreal\ Engine/EpicGamesLauncher/EpicGamesLauncher.log

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[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ConstructTime: 5:45 min

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: TotalDecryptTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: UninstallActionTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: MoveFromStageTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: FileAttributesTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: VerifyTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: CleanUpTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: PrereqTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessPausedTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessActiveTime: 5:59 min

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessExecuteTime: 5:59 min

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessSuccess: FALSE

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ErrorCode: FC02

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: FailureReasonText: A file corruption has occurred. Please try again.

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: FailureType: FileConstructionFail

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: NumInstallRetries: 4

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: MaxDiskSpaceNeededWhenDeletingChunkDbsIfRequested: 0

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryFailureType 0: FileConstructionFail

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryErrorCodes 0: FC02

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryFailureType 1: FileConstructionFail

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryErrorCodes 1: FC02

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryFailureType 2: FileConstructionFail

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryErrorCodes 2: FC02

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryFailureType 3: FileConstructionFail

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: RetryErrorCodes 3: FC02

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: FinalProgressValue: 0.745719

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: OverallRequestSuccessRate: 0.000000

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ExcellentDownloadHealthTime: 5:41 min

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: GoodDownloadHealthTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: OkDownloadHealthTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: PoorDownloadHealthTime: 14.1 sec

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: DisconnectedDownloadHealthTime: 0 us

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: DriveStorePeakBytes: 0

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: MemoryStoreSizePeakBytes: 121,634,816

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: MemoryStoreSizeLimitBytes: 685,899,776

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessRequiredDiskSpace: 3,169,072,398

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: ProcessAvailableDiskSpace: 172,787,105,792

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: HTTPVersion: CURL_HTTP_VERSION_1_1

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: CurlBufferSize: 524288

[2026.06.02-08.28.16:412][532]LogBuildPatchServices: Build Stat: CurlMultiplexing: FALSE

[2026.06.02-08.28.16:424][532]LogTemp: HandleTaskComplete: AppId [ue:7299c1cd206b4bb58658a98199b66860:UE_5.7]

[2026.06.02-08.28.16:425][532]LogPortal: Error: FAlertReporter: Reporting Alert code: IS-IN-FC02

[2026.06.02-08.28.16:426][532]LogAlertListener: No user messaging in AlertMessageRepository for: IS-IN-FC02

[2026.06.02-08.28.16:430][532]LogAutoUpdateService: HandlePatchComplete: The installation failed for ue:7299c1cd206b4bb58658a98199b66860:UE_5.7:5.7.4-51494982+++UE5+Release-5.7-Mac app in any reason, the installer will no longer try to perform an automatic update again until the user specifies it

[2026.06.02-08.28.16:495][532]LogCommunityPortalPatcher: Warning: OnDownloadHealthChanged: Failed. No active task

6

Also having the same issue on an M1 mac, tahoe 26.5,
download consistently fails at 74.57% with FileConstructionFail according to logs

Have tried many things including:

  • Removing and reinstalling ue5 across different versions
  • Reinstalling epic games launcher
  • Clearing cache
  • Unchecking the Engine Source item
  • Tried installing to Documents folder instead of default path
  • Reinstalled Xcode Command Line Tools
  • Flushing DNS
  • Granting Full Disk Access to Epic Games Launcher
7

Hi, I had the same problem and finally fixed it, I’ve made a detailed post here: Fixed: Unreal Engine 5.4.4 install failed around 70%, IS-IN-FC02, Xcode not detected, then crash on MacBook Air M1 / macOS Sequoia

So if I had to install Unreal Engine again on an Apple Silicon Mac, I would do this:

# Make sure macOS developer tools point to full Xcode, not only Command Line Tools
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer

# Accept the Xcode license
sudo xcodebuild -license

# Install Rosetta, needed by some Intel helper binaries
softwareupdate --install-rosetta --agree-to-license

# Optional but useful if Epic install fails around 70% with "file corruption" which is our exact case
sudo sysctl -w kern.maxfiles=131072 kern.maxfilesperproc=65536
ulimit -S -n 65536 && open -a "Epic Games Launcher"

Then resume the Unreal Engine installation from the Epic Games Launcher.

It took me a while to figure it out, I hope it works for you too!