# Can't Install Unreal on My MacBookAir M1 Error IS-IN-FC02 **URL:** \ **Category:** Getting Started & Setup\ **Tags:** unreal-engine\ **Created:** [May 26, 2026, 1:54pm UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515 "2026-05-26T13:54:38Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![IceDragonGattor](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@IceDragonGattor](https://forums.unrealengine.com/u/IceDragonGattor)\ **Post date:** [May 26, 2026, 1:54pm UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/1 "2026-05-26T13:54:38Z")
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 ---
**Author:** ![OrbitalZones](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/orbitalzones/32/1214470_2.png) [@OrbitalZones](https://forums.unrealengine.com/u/OrbitalZones)\ **Post date:** [May 27, 2026, 8:14pm UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/2 "2026-05-27T20:14:57Z")
Did you check out the [official link](https://www.epicgames.com/help/epic-games-store-c-202300000001639/error-messages-c-202300000001736/is-in-fc-errors-on-the-epic-games-launcher-a202300000016497) for this kind of error? Try and grant the Epic Games Launcher full disk access under Privacy & Security settings. ---
**Author:** ![binhboongop9](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@binhboongop9](https://forums.unrealengine.com/u/binhboongop9)\ **Post date:** [May 28, 2026, 5:04am UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/3 "2026-05-28T05:04:06Z")
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. ---
**Author:** ![morieris](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@morieris](https://forums.unrealengine.com/u/morieris)\ **Post date:** [May 29, 2026, 11:38pm UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/4 "2026-05-29T23:38:26Z")
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). ---
**Author:** ![yul.n](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@yul.n](https://forums.unrealengine.com/u/yul.n)\ **Post date:** [June 5, 2026, 3:54am UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/5 "2026-06-05T03:54:29Z")
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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 ---
**Author:** ![yul.n](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@yul.n](https://forums.unrealengine.com/u/yul.n)\ **Post date:** [June 5, 2026, 3:54am UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/6 "2026-06-05T03:54:46Z")
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 ---
**Author:** ![Hashiba](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/hashiba/32/1184100_2.png) [@Hashiba](https://forums.unrealengine.com/u/Hashiba)\ **Post date:** [June 19, 2026, 7:53pm UTC](https://forums.unrealengine.com/t/cant-install-unreal-on-my-macbookair-m1-error-is-in-fc02/2724515/7 "2026-06-19T19:53:57Z")
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](https://forums.unrealengine.com/t/fixed-unreal-engine-5-4-4-install-failed-around-70-is-in-fc02-xcode-not-detected-then-crash-on-macbook-air-m1-macos-sequoia/2729988) So if I had to install Unreal Engine again on an Apple Silicon Mac, I would do this: ```bash # 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!