"Launcher" program not launching the engine

Hello. I have downloaded the launcher program and UE engine, but when I press “launch” it says “launching” and nothing happens. Any ideas?

The problem was a missing file from Visual C++ Redistributable which failed to install. It can be downloaded from here.

Hi derloopkat,

I’m sorry to hear that you’re having trouble. The issue only happens with 4.10? Would it be possible for you to delete your installation of 4.10 and redownload it to see if the error occurs again? If so, could you send us your dxdiag and debug logs from when you attempt to run 4.10? Direction on how to generate your logs can be found here.

Please see attachments. Originally I’ve tried to do what you suggested and didn’t work. Today I’ve repeated the installation for version 4.10 in order to get the logs. Unfortunately this engine still doesn’t work.

Hi derloopkat,

Thank you for the information.

When you click on “launch” for the 4.10 version, does it stay grayed out the entire time or does it becoming clickable again while you are waiting?

Could you please try the following:

  • Close the launcher.
  • Right click on the Epic launcher icon and go to “Run as Administrator.”
  • Click on the drop down for 4.10.0 and select remove.
  • Reinstall 4.10.0 after it has been removed.
  • After the engine has been installed, Click on the drop down and select verify.
  • Once the engine is verified, attempt to run it.

If you close the launcher for any reason, restart it by right clicking and choosing “Run as Administrator”

Based on your dxdiag, your system may run the editor, but it is under the recommended speed of 2.5 GHz or faster. Due to this you may see some delay during install and when running the editor.

Once you’ve had a chance to perform these steps, please reply back with an update.

The attached animation will answer your question. The button is enabled and gets greyed out on launching. Regarding to running as admin and verifying installation, I believe I tried all these steps before reporting the problem but I can repeat it again later if you believe it can help.

Hello again!

Let’s try bypassing the launcher and running the editor directly. Navigate to \Program Files\Epic Games\4.10\Engine\Binaries\Win64 and look for the UE4Editor.exe file. Right click this and select “Run as Administrator”. Does the engine start?

If the editor doesn’t open, start the launcher and do a verify on the 4.10 install.

If I try to run the exe file for the editor as admin, it says “The program can’t start because api-ms-win-crt-runtime-l1-1-0.dll is missing from your computer. Try reinstalling the program to fix this problem”. Same problem after verifying the engine as admin.

After installing the missing file (which is part of Visual C++ Redistributable for Visual Studio 2015), Engine 4.10 works. Thank you very much.