If you’re trying to install the engine, ensure you Run as Administrator.

I have the same issue LS-0019-IS-PQR23.

Problem fixed!
Right-click on your Epic Games launcher desktop shortcut Select “Properties” In the line labeled “Target,” add the following to the very end (after the quotation mark): -SkipBuildPatchPrereq It should look something like this: “C:\Program Files\Epic Games\Launcher\Portal\Binaries\Win64\EpicGamesLauncher.exe” -SkipBuildPatchPrereq
Click “Apply” Double click the shortcut to run the launcher and try again and make sure to add the space between the quotation and dash