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invalid F drive - can't uninstall/install

I've downloaded UE a while ago, but files were missing. I tried to uninstall it, but it keeps saying invalid F drive. I was looking for traces of any UE files on my computer to see if I could get rid of it manually and I couldn't find any, but it keeps showing up as a program that I could uninstall (control panel -> uninstall a program).

So I tried to install it again and it says invalid F drive. I don't know what it's referring to, I have a C drive, external E drives, but not an F drive and I have no idea how to redirect it.


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asked Mar 03 '15 at 05:15 AM in Installation & Setup

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avatar image Steve Hardister ♦♦ STAFF Mar 04 '15 at 08:36 PM

Hi celc,

Can you post the Dxdiag for your machine? Additionally, have you followed the instructions specifically from this link: https://docs.unrealengine.com/latest/INT/GettingStarted/Installation/index.html

What operating system are you running?

Did you see this screen which specifically says it will install to your C drive?

alt text

Please respond with the requested information.


install.jpg (41.8 kB)
avatar image celc Mar 05 '15 at 03:42 AM

I don't see the screen that you posted. The "Invalid F:/ Drive" error automatically pops up when I run the installer. I'm running on Windows 8.1alt text

dxdiag.png (25.5 kB)
avatar image Steve Hardister ♦♦ STAFF Mar 05 '15 at 01:43 PM

Try disabling your external E drive, rebooting. Then go into the control panel and delete any UE4 associated files, if present. With the external drive still disabled, restart the download and installation process from scratch, including re-downloading the installer. (Delete the old installer if present before re-downloading the new one.) Install to your C drive, if possible. If successful, then you can reconnect your external drive.

avatar image celc Mar 06 '15 at 12:57 AM

Thanks, the utility that Pete suggested solved my problem. Thanks for your help!

avatar image Harlena Dec 05 '17 at 09:06 PM

Guys, I have found a solution for this problem. So I downloaded this application called "Revo uninstaller" and selected Epic Games on the list. It deletes all the leftovers from the registries. After I finished deleting everything it let me install the launcher :) I hope it helps!

avatar image aryamgaming Sep 10 '18 at 03:10 PM

yessss this worked!!! thanks!!! easy and it's free! portable as well! no install needed.

avatar image GPH Oct 26 '18 at 12:04 AM

Thanks! It worked pretty well! :D +1 Revo unninstaller

avatar image Wastelandpirate Dec 18 '18 at 02:43 PM

Revo uninstaller totally works, Tried everything else but revo saved me thanks non-epic employee!!

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7 answers: sort voted first

Well, I had the same issue, I had UE4 installed on F drive, then I renamed the drive to D, so installing new launcher produced the same issue.

How I did solve it ?

My installation dir was F:\UE4\EpicGames, the new location was D:\UE4\EpicGames,

So I looked over the registery (regedit.exe) searched for "F:\UE4\EpicGames" and replaced it with "D:\UE4\EpicGames"

You'll find tons of "F:\UE4\EpicGames", the correct one in my case was located on HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall

So I suggest you start your search from this directory,

(I have found it exactly under \Uninstall{325AC861-EDAF-440B-97DD-259906E216D3})

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answered Oct 10 '15 at 12:23 PM

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Hi Celc,

You may also want to give the following utility a try: http://support.microsoft.com/mats/Program_Install_and_Uninstall

I just reproduced the issue you are reporting and this utility was able to remove the Launcher allowing me to install it again.

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answered Mar 05 '15 at 07:24 PM

[Epic]Pete (suspended)
avatar image celc Mar 06 '15 at 12:56 AM

Thanks! This worked! I used it to fix the uninstall issue which ended up fixing the install issue.

avatar image Nathan253 Jul 19 '17 at 11:11 PM

This link to microsoft is amazing. My f: failed and I couldn't uninstalled programs still linked to it. This solves the issue for you.

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Wow... I'm in shock... I just spent hours trying to fix this after my hard drive committed suicide... luckily I had all my projects backed up :D but couldn't reinstall or uninstall UE4... I seen this post and tried the utility and BOOOOM!! back in action!!! Anybody else have issues like this give this utility a shot for sure it worked for me might for you too.

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answered May 29 '17 at 03:27 PM

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I just had this problem with an old SSD dying that had my UE4 game and EPIC install on it. I tried editing the registry and other fixes but was failing and couldn't reinstall or uninstall EPIC GAME LAUNCHER.

**MY FIX THAT WORKED FOR ME: I installed another HDD where the old one was, it appeared as F:/ , then Windows would let me uninstall EPIC (even though it wasn't on the new drive) and reinstall it to another drive.

I hope that helps!

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answered Oct 16 '17 at 03:03 AM

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The drive you are trying to install the launcher on CHANGE THE DRIVE LETTER TO THE ONE INVALID. Ex. Drive C in computer "INVALID DRIVE (Z:)" Change drive letter C to Z then uninstall epic games launcher. after uninstalling epic CHANGE BACK DRIVE TO ORIGINAL LETTER. this worked for me I hope my instructions are clear im not really good at English.

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answered Jun 03 '18 at 09:42 PM

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holyyy smokes. i created an account just to tell you revo worked! it's free! good job man!

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answered Sep 10 '18 at 03:09 PM

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Thanks the guy who said RevoUninstaller, works! But if it say Invalid drive E:// Continously in the Uninstaller just go to select Special and Next and delete the things that are popping up. NP :)

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answered Dec 19 '18 at 12:35 PM

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