UE-4.10.2 install from launcher fails - R-1638

Development Getting Started & Setup
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1

I have source builds on my machine that work. However, I wanted to test a plugin with the launcher installed version of the engine for another user. When it tries to install 4.10.2 it fails with error R-1368. Here is the log file from the prerequisites installer:

[03F8:2148][2016-01-28T16:41:00]i001: Burn v3.8.1128.0, Windows v6.3 (Build 9600: Service Pack 0), path: E:\UnrealLauncher\Epic Games\4.10\Engine\Extras\Redist\en-us\UE4PrereqSetup_x64.exe, cmdline: ‘’
[03F8:2148][2016-01-28T16:41:00]i000: Setting string variable ‘WixBundleLog’ to value ‘C:\cygwin64\tmp\UE4_Prerequisites_(x64)_20160128164100.log’
[03F8:2148][2016-01-28T16:41:00]i000: Setting string variable ‘WixBundleOriginalSource’ to value ‘E:\UnrealLauncher\Epic Games\4.10\Engine\Extras\Redist\en-us\UE4PrereqSetup_x64.exe’
[03F8:2148][2016-01-28T16:41:00]i000: Setting string variable ‘WixBundleName’ to value ‘UE4 Prerequisites (x64)’
[03F8:2148][2016-01-28T16:41:00]i100: Detect begin, 9 packages
[03F8:2148][2016-01-28T16:41:00]i000: Setting string variable ‘NETFRAMEWORK40’ to value ‘1’
[03F8:2148][2016-01-28T16:41:00]i000: Setting string variable ‘Netfx20Version’ to value ‘2.0.50727.4927’
[03F8:2148][2016-01-28T16:41:00]i000: Registry value not found. Key = ‘Installer\Assemblies\Global’, Value = ‘Microsoft.mshtml,Version=“7.0.3300.0”,PublicKeyToken=“b03f5f7f11d50a3a”,Culture=“neutral”,FileVersion=“7.0.3300.0”’
[03F8:2148][2016-01-28T16:41:00]i000: Setting numeric variable ‘MshtmlVersion’ to value 0
[03F8:2148][2016-01-28T16:41:00]i102: Detected related bundle: {2890ae6b-90e9-448d-b3e6-97e43c21e2fd}, type: Upgrade, scope: PerMachine, version: 1.0.13.0, operation: Downgrade
[03F8:2148][2016-01-28T16:41:00]i052: Condition ‘Netfx20Version AND (Netfx20Version >= v2.0.50727.5420)’ evaluates to false.
[03F8:2148][2016-01-28T16:41:00]i052: Condition ‘NETFRAMEWORK40’ evaluates to true.
[03F8:2148][2016-01-28T16:41:00]i103: Detected related package: {66C5838F-B854-4A55-89E6-A6138747A4DF}, scope: PerMachine, version: 1.0.0.0, language: 0 operation: MajorUpgrade
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: NetFx20_32, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: NetFx40Redist, state: Present, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: WI45_XP_v3_X86, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: WI45_XP_v4_X64, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: Windows6.0_KB942288_v2_x86.msu, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: Windows6.0_KB942288_v2_x64.msu, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: VC140_X86, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: vc140_X64, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i101: Detected package: PrereqSetup, state: Absent, cached: None
[03F8:2148][2016-01-28T16:41:00]i052: Condition ‘VersionNT64’ evaluates to true.
[03F8:2148][2016-01-28T16:41:00]i199: Detect complete, result: 0x0
[03F8:2984][2016-01-28T16:41:04]i000: Setting numeric variable ‘EulaAcceptCheckbox’ to value 1
[03F8:2984][2016-01-28T16:41:04]e000: Error 0x80070666: Cannot install a product when a newer version is installed.

2

This worked for me:

  1. Uninstall UE4 Prerequisites
  2. Uninstall VC++ 2015 Redistributable x86 and x64
  3. Open regedit and search for keys containing “2890ae6b-90e9-448d-b3e6-97e43c21e2fd” and delete them.
  4. Install UE4
  5. Install the latest VC++ 2015 Redistributable x86 and x64
3

Hi iktomi. We aren’t currently aware of an R-1368 installation error. Are you referring to R-1638 instead?

4

Yes indeed I meant R-1638

5

Hello!

We have recently updated the launcher to address some of the prerequisite issues. Please see the accepted answer to this post for the steps to follow.

If this does not resolve the issue, please post back and keep us updated.