Hello,

I've been following a YouTube tutorial on EUP but halfway through the process, while installing EUP L&O, I received the error message, "A fatal error occurred during installation. Please check log file for error details." and have no idea as to what caused this - I've been following the tutorial for over an hour (it's part of a series of tutorials for LSPDFR) and I'm sure I've done everything correctly. I'll also show my log text, please help.

Error log

[09/10/2026 17:49:52] [15516] INFO -> Current GameId: "Five"

[09/10/2026 17:49:52] [15516] INFO -> Current GamePlatform: "pc"

[09/10/2026 17:49:52] [15516] INFO -> Current GamePath: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\"

[09/10/2026 17:49:52] [21704] INFO -> Loading package

[09/10/2026 17:49:52] [21704] INFO -> Loading package from "C:\Users\ela73\Desktop\Playground\566105533_EUPLO8.3.oiv"

[09/10/2026 17:49:52] [21704] INFO -> Package file was opened successfully

[09/10/2026 17:49:52] [21704] INFO -> Loading assembly from "assembly.xml"

[09/10/2026 17:49:52] [21704] INFO -> Reading assembly file "assembly.xml"

[09/10/2026 17:49:52] [21704] INFO -> Format version: "2.0"

[09/10/2026 17:49:52] [21704] INFO -> Package info class: "TPackageInfo20"

[09/10/2026 17:49:52] [21704] INFO -> Reading package info

[09/10/2026 17:49:52] [21704] INFO -> Package ID: "{64DE0490-6A4B-468E-B963-4B7DB6223FAA}"

[09/10/2026 17:49:52] [21704] INFO -> Package target: "Five"

[09/10/2026 17:49:52] [21704] INFO -> Package name: "EUP: Law & Order 8.3"

[09/10/2026 17:49:52] [21704] INFO -> Package version: "8.3"

[09/10/2026 17:49:52] [21704] INFO -> Package author: "EUP Team"

[09/10/2026 17:49:52] [21704] INFO -> Package contains changes for RPF archives

[09/10/2026 17:49:52] [21704] INFO -> Package format supports "mods" folder

[09/10/2026 17:49:52] [21704] INFO -> Loading package icon from "icon.png"

[09/10/2026 17:49:52] [21704] INFO -> Package loaded successfully

[09/10/2026 17:49:52] [15516] INFO -> Current package have only one content to install

[09/10/2026 17:49:52] [15516] INFO -> The "mods" folder supported by current game.

[09/10/2026 17:49:52] [15516] INFO -> Show install options dialog before installation

[09/10/2026 17:49:52] [15516] INFO -> Show confirm install dialog before installation

[09/10/2026 17:49:52] [15516] INFO -> Begin installation

[09/10/2026 17:49:52] [15516] INFO -> No other running installation found

[09/10/2026 17:49:52] [13344] INFO -> Install options

{

Content Index: "-1"

Use "mods" Folder: "True"

}

[09/10/2026 17:49:52] [13344] INFO -> Package installer class: "TPackageInstaller20"

[09/10/2026 17:49:52] [13344] INFO -> Validate content files

[09/10/2026 17:49:52] [13344] INFO -> Validate content files SUCCEEDED

[09/10/2026 17:49:52] [13344] INFO -> Installation

[09/10/2026 17:49:52] [13344] INFO -> Process ARCHIVE "GTA V" with path "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\"

[09/10/2026 17:49:52] [13344] INFO -> ARCHIVE "update\update.rpf" is exists

[09/10/2026 17:49:52] [13344] INFO -> ARCHIVE "update\update.rpf" is already in the "mods" folder

[09/10/2026 17:49:52] [13344] INFO -> Process ARCHIVE "update.rpf" with path "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

[09/10/2026 17:49:52] [13344] INFO -> Delete file in archive

{

Path: "dlc_patch\mpimportexport\content.xml"

Archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> File with path "dlc_patch\mpimportexport\content.xml" not found

[09/10/2026 17:49:52] [13344] INFO -> Delete file in archive

{

Path: "dlc_patch\mpimportexport\setup2.xml"

Archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> File with path "dlc_patch\mpimportexport\setup2.xml" not found

[09/10/2026 17:49:52] [13344] INFO -> Delete file in archive

{

Path: "x64\eup\script_txds.rpf"

Archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> File with path "x64\eup\script_txds.rpf" not found

[09/10/2026 17:49:52] [13344] INFO -> Delete file in archive

{

Path: "x64\eup\eup_componentpeds_p.rpf"

Archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> File with path "x64\eup\eup_componentpeds_p.rpf" not found

[09/10/2026 17:49:52] [13344] INFO -> Delete file in archive

{

Path: "x64\eup\eup_componentpeds.rpf"

Archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> File with path "x64\eup\eup_componentpeds.rpf" not found

[09/10/2026 17:49:52] [13344] INFO -> Process TEXT FILE "dlclist.xml" with path "common\data\dlclist.xml" in archive "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*\eup\*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*\eupme\*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*\euptactical\*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*\euprescue\*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*\sup\*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*/eup/*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*/eupme/*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*/euptactical/*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*/euprescue/*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Remove line from text file

{

Line: "*/sup/*"

Search condition: "Mask"

Line Index: "-1"

}

[09/10/2026 17:49:52] [13344] INFO -> Insert line into text file

{

New line: " <Item>dlcpacks:/eup/</Item>"

Search for: "*</Paths>*"

Search condition: "Mask"

Insert: "Before"

Line Index: "106"

}

[09/10/2026 17:49:52] [13344] INFO -> TEXT FILE "dlclist.xml" processed

[09/10/2026 17:49:52] [13344] INFO -> Unable to put edited TEXT FILE back into archive

{

Path: "common\data\dlclist.xml"

Parent archive: "C:\Program Files\Rockstar Games\Grand Theft Auto V Legacy\mods\update\update.rpf"

}

[09/10/2026 17:49:52] [13344] INFO -> ARCHIVE "update.rpf" processed

[09/10/2026 17:49:52] [13344] INFO -> ARCHIVE "GTA V" processed

[09/10/2026 17:49:52] [13344] INFO -> Installation FAILED

Solution found

For some reason, even after quitting from Rockstar Games launcher, GTA V was still running as a process even though it didn't show on my taskbar or anything, sorry for the unnecessary post lol

Happens to the best of us! Thanks for sharing though