megaproxy

Short answer: the default (and recommended) location on a Mac is

```
/Users/Shared/Epic Games/UE_5.x
```

That's where the Epic Games Launcher wants to put it, and it's the path that gives the fewest permission headaches. So the folder isn't your problem — the "disk full at ~75%" is almost always **not** literally about your total disk size.

Here's what's actually going on, in rough order of likelihood:

**1. Purgeable space / APFS snapshots (most common).**
Finder shows tons of "free" space, but a big chunk is *purgeable* (local Time Machine snapshots, caches). The installer needs real, immediately-available free space and can't reclaim purgeable space on demand. Check the real number:
- Apple menu →  About This Mac → More Info → Storage, or
- `df -h /System/Volumes/Data` in Terminal — look at **Avail**, not what Finder claims.

To reclaim it: `tmutil thinlocalsnapshots / 999999999999 4` (thins local snapshots), and empty caches/Trash.

**2. Install needs ~2× the final size temporarily.**
UE5 is ~40–60 GB installed, but the launcher downloads chunks *and* decompresses, so you can need 80–120 GB free *during* install even though the end result is smaller. 75% is right about where the working set peaks.

**3. The launcher's "disk full" message is frequently a misreport.**
It sometimes surfaces a write/verification failure (corrupted chunk, interrupted download, permission issue on `/Users/Shared`) as a generic disk-full error. Fixes that work:
- Clear the launcher's download cache: quit the launcher, delete `~/Library/Application Support/Epic/EpicGamesLauncher/VaultCache` (and `Data`), relaunch, retry.
- Make sure `/Users/Shared/Epic Games` is writable.

**4. External drive?**
If you redirected the install to an external/exFAT volume, exFAT chokes on UE's large file count and sparse files. Use an APFS-formatted volume instead.

So: keep the default `/Users/Shared/Epic Games/` location, but first verify your *actual* available space with `df -h`, then clear the VaultCache and retry. That combination resolves the 75% failure the vast majority of the time.

Want me to give you the exact Terminal commands to check purgeable space and clear the cache in one go?

Your disk is fine — `/System/Volumes/Data` shows **372 GiB available**. So the "disk full" error is a misreport, not reality. (That `/Volumes/Epic Games Launcher` line at the bottom is just the mounted installer DMG — 871 MB, ignore it.)

This means it's a corrupted download chunk, a stale cache, or a write/permission hiccup that the launcher is mislabeling as "disk full." Here's the fix, in order:

**1. Clear the launcher's download cache.** Quit the Epic Games Launcher completely, then:

```bash
rm -rf ~/Library/"Application Support"/Epic/EpicGamesLauncher/VaultCache
rm -rf ~/Library/Caches/com.epicgames.EpicGamesLauncher
```

Relaunch and retry the install. This alone fixes it most of the time — a bad chunk gets re-downloaded clean.

**2. Make sure the install target is writable:**

```bash
ls -ld /Users/Shared/"Epic Games"
```

If it doesn't exist or isn't owned by you/staff, create and fix it:

```bash
sudo mkdir -p /Users/Shared/"Epic Games"
sudo chown -R "$(whoami)":staff /Users/Shared/"Epic Games"
chmod -R 775 /Users/Shared/"Epic Games"
```

**3. If it still dies at 75%,** it's a specific corrupted chunk. Delete the partial UE install folder (`/Users/Shared/Epic Games/UE_5.x`) so it doesn't try to resume on top of bad data, then start the install fresh.

Keep the default `/Users/Shared/Epic Games/` location through all of this — redirecting elsewhere (especially an external or non-APFS volume) tends to *cause* this error rather than fix it.

Run step 1 first and retry — want me to give you a single combined command that clears both caches and checks the folder permissions in one shot?

• ToolSearch select:WebSearch 5ms 51 B

• WebSearch Epic Games Launcher IS-IN-FC02 error Unreal Engine install fix 13.9s 3.3 KB

That error code confirms it — **IS-IN-FC02** means *"failed to create file"*, not a real disk-space shortage (which would be a different code, IS-DS01). So despite the generic "disk full"-style wording, your 372 GiB free is irrelevant — the launcher is failing to *write/assemble* a file at the 75% mark.

On Mac specifically, there are two dominant causes for this hitting around 70–75%:

**1. Missing Xcode / Command Line Tools (very common on Mac).**
The UE install on macOS pulls in compiler-related steps near the end, and if Xcode or its command line tools aren't present/selected, the install fails right around 70–75% with IS-IN-FC02. Fix:

```bash
xcode-select --install
```

If you have the full Xcode app, also run once:

```bash
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
sudo xcodebuild -license accept
```

Then retry the UE install. This is the exact scenario in the Epic forum thread for an M1 Mac on Sequoia failing at ~70%.

**2. A file-creation failure from cache/permissions** (the other usual trigger). So in order:

- Clear the launcher cache — quit the launcher, then delete the `webcache` folder under `~/Library/Application Support/Epic/EpicGamesLauncher/Saved/` (plus the `VaultCache` I mentioned earlier).
- Make sure `/Users/Shared/Epic Games` is writable (the `chown`/`chmod` from before).
- Delete the partial `UE_5.x` folder so it doesn't resume on top of a half-written file.
- Temporarily pause any antivirus/security tool scanning the install folder.

Given you're on a Mac and it dies right at ~75%, **start with `xcode-select --install`** — that's the most likely culprit for this specific code at this specific percentage. Then clear caches and retry.

Sources:
- [Fixed: UE 5.4.4 install failed around 70%, IS-IN-FC02, Xcode not detected — MacBook Air M1 / 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)
- [IS-IN-FC02 cannot install UE 5.2 on Mac](https://forums.unrealengine.com/t/is-in-fc02-cannot-install-ue-5-2-on-mac/2717929)
- [IS-FC02 or IS-RE-FC02: Failed to create file — Epic Games Support](https://www.epicgames.com/help/c-202300000001639/c-202300000001736/is-fc02-or-is-re-fc02-failed-to-create-file-a202300000010001)
- [How to Fix IS-IN-FC02-3 Error — Appuals](https://appuals.com/epic-games-launcher-error-is-in-fc02-3/)