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Unreal Engine: Prerequisites Stuck

Hello.

Recently due to several complications that I've had to sort out, I have been forced to reinstall Unreal Engine to continue my projects.

However, while attempting to do so, I have run into a problem: the Engine is installed normally up until it gets to the Prerequisites phase, where the installation becomes stuck.

The launcher does not tell me that the installation failed, in fact it tells me nothing at all, all it says is that the prerequisites are currently installing. Forever.

I have waited for several hours straight, but it seems that the prerequisites simply never finish. I've tried cancelling the installation and restarting, opening the launcher as administrator, tried reinstalling the launcher, nothing has worked thus far.

What exactly could be causing this problem? How can I, or should I, try fixing it?

Product Version: UE 4.15
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asked Mar 25 '17 at 11:19 AM in Installation & Setup

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Dr Pawsworth
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Hi Dr Pawsworth,

I'm sorry that you are having an issue with the Epic Games Launcher. In order for us to offer the best support, we have recently modified the process for how Epic Games can help troubleshoot your Launcher issue. Please visit http://help.epicgames.com/ for technical support, here you can find information and solutions for common issues, as well as a contact form if you still need additional assistance. Thanks!

On a side note, I did a quick search on there and this page might help: http://help.epicgames.com/customer/en/portal/articles/2289966-prerequisites-have-failed-to-install-when-installing-the-epic-games-launcher?b_id=9727

-Matt W.

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answered Mar 29 '17 at 09:13 PM

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Hi.

To ensure that you have all of the necessary prereqs, download VS2017 Community and install the option UNREAL LAUNCHER. This will ensure everything you need is installed. And, if you do any development and or use plugins you will need VS2017.

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answered Mar 27 '17 at 06:38 PM

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teak421
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avatar image guyal Jun 14 '18 at 12:00 PM

Alternate solution - I was having similar symptoms today for 4.20.0 Preview 1, which I was trying to solve using teak421's advice (thanks) but mine was solved by a simple reboot

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Download Visual Studio 2017 community and install the component unreal launcher. This will ensure everything you need is installed

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answered Sep 28 '18 at 08:35 PM

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Muhammad Jansher
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In my case, I just had to make sure Visual Studio is closed. It didn't specify prerequisites are installing or not, it just said "prerequisites". But I was working on a Unity VR project at the same time, and once I closed VS2017, the engine launched. Reproduced here in 4.22.3.

If that doesn't fix it, maybe check task manager for a running VS instance

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answered Jul 13 '19 at 09:35 PM

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lsummers
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