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I'm a bit surprised no one has stickied this link:

https://web.archive.org/web/20190607220945/http://www.classicgaming.biz/wordpress/2018/02/18/return-to-castle-wolfenstein-iortcw/#content

(Copy and paste the entire above link into your browser, because GOG's forum does not handle the link correctly).

If you haven’t done so, install your original game and remember the target installation directory as you need some game files later

Browse to the iortcw project release folder https://github.com/iortcw/iortcw/releases and grap the latest release files for your operating system. At the point of writing the latest version was v1.51b.

Also grap the latest patch file from this site: This was this file as per now patch-data-141.zip

Extract the latest release zip into a location where you like to have your installation going forward (like c:\Games\ioRTCW\ in Windows or /home/joe/Games/ioRTCW/ in Linux

Go to the location of your existing original installation, go into the “Main” folder and copy the following files over to your ioRTCW “main” folder: pak0.pk3, sp_pak1.pk3 sp_pak2.pk3 sp_pak3.pk3. This is the game date for the single player mod.

Then extract the content of patch-data-141.zip (or a newer version in the meantime) into your iortcw folder and merge its content into it

And that should be it actually: Go to your iortcw installation folder and start either the “iowolfsp*” file for single player or “iowolfmp*” for multiplayer.
Edit 8/18/2020: IORTCW Readme file, now with Quick Start Guide:

https://github.com/iortcw/iortcw/blob/master/README.md#quick-start-guide
Post edited September 30, 2024 by TheBigCore
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TheBigCore: I'm a bit surprised no one has stickied this link:

http://www.classicgaming.biz/wordpress/2018/02/18/return-to-castle-wolfenstein-iortcw/

If you haven’t done so, install your original game and remember the target installation directory as you need some game files later

Browse to the iortcw project release folder https://github.com/iortcw/iortcw/releases and grap the latest release files for your operating system. At the point of writing the latest version was v1.51b.

Also grap the latest patch file from this site: This was this file as per now patch-data-141.zip

Extract the latest release zip into a location where you like to have your installation going forward (like c:\Games\ioRTCW\ in Windows or /home/joe/Games/ioRTCW/ in Linux

Go to the location of your existing original installation, go into the “Main” folder and copy the following files over to your ioRTCW “main” folder: pak0.pk3, sp_pak1.pk3 sp_pak2.pk3 sp_pak3.pk3. This is the game date for the single player mod.

Then extract the content of patch-data-141.zip (or a newer version in the meantime) into your iortcw folder and merge its content into it

And that should be it actually: Go to your iortcw installation folder and start either the “iowolfsp*” file for single player or “iowolfmp*” for multiplayer.
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TheBigCore:
Shouldn't you just extract the iortcw files into the installation directory?
Does this work?
Game worked fine on my Win7 machine except that it basically crashes - "WolfSP.exe has stopped working" - every time I load a save-game, and then when I tried to changed the resolution. Hopefully this will help with that.

edit: this worked for me I believe, as far as fixing problems with loading games.

https://github.com/iortcw/iortcw/releases/tag/1.51c
https://github.com/iortcw/iortcw/releases/download/1.51b/patch-data-141.zip

I downloaded iortcw-1.51c-win-x86.zip and patch-data-141.zip. Followed instructions. Am running via "ioWolfSP.x86.exe" shortcut
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smuggly: Does this work?
It may help you or others.
Post edited August 18, 2019 by tfishell
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tfishell: Game worked fine on my Win7 machine except that it basically crashes - "WolfSP.exe has stopped working" - every time I load a save-game, and then when I tried to changed the resolution. Hopefully this will help with that.

edit: this worked for me I believe, as far as fixing problems with loading games.

https://github.com/iortcw/iortcw/releases/tag/1.51c
https://github.com/iortcw/iortcw/releases/download/1.51b/patch-data-141.zip

I downloaded iortcw-1.51c-win-x86.zip and patch-data-141.zip. Followed instructions. Am running via "ioWolfSP.x86.exe" shortcut
avatar
smuggly: Does this work?
avatar
tfishell: It may help you or others.
Install the unofficial 1.42 patch instead. It works out of the box.
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klappis: Install the unofficial 1.42 patch instead. It works out of the box.
I still had a problem with crashing when loading savegames even with 1.42. So I'm glad iortcw worked.
Post edited August 20, 2019 by tfishell
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klappis: Install the unofficial 1.42 patch instead. It works out of the box.
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tfishell: I still had a problem with crashing when loading savegames even with 1.42. So I'm glad iortcw worked.
Glad to see that iortcw resolved your issue. I have also initiated a pull request on iortcw to get that information added to the program's readme file.
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tfishell: Game worked fine on my Win7 machine except that it basically crashes - "WolfSP.exe has stopped working" - every time I load a save-game, and then when I tried to changed the resolution. Hopefully this will help with that.

edit: this worked for me I believe, as far as fixing problems with loading games.

https://github.com/iortcw/iortcw/releases/tag/1.51c
https://github.com/iortcw/iortcw/releases/download/1.51b/patch-data-141.zip

I downloaded iortcw-1.51c-win-x86.zip and patch-data-141.zip. Followed instructions. Am running via "ioWolfSP.x86.exe" shortcut

It may help you or others.
avatar
klappis: Install the unofficial 1.42 patch instead. It works out of the box.
Yea I got this working and it's great.