JC4MP Forum

Hiya, I’d love to try the JCMP client. So I’ve installed it in the same Wine/Proton prefix as Just Cause 4 but am unfortunately facing issues.

When connecting to a server (e.g. JCUnlimited Freeroam), it:

• downloads missing mods, (If any are present)
• finds my Steam instance, (Provided Steam is running via the native Linux build and not the wine/proton prefix)
• attempts to launch JC4, (AFAIK)
• then exits silently as if successful — but the game never starts. (Always exits silently after "connecting dialog")

No “Steam not found”/"Steam not running" dialog appears.

If I can access some sort of debug logs they would be greatly helpful, that way I can hopefully find the source of the issue/s..

Otherwise the launcher works fine, aside from these minor issues/bugs:

• hidden mouse cursor within client (low-priority; can be temporarily fixed via DE accessibility),
• occasional blank window or tray-icon-only UI. (Most likely due to missing dependencies or Incorrect launch)

If any other information is required, @ me.. Thankyou for your time.

Just found out its running in the background, No clue how to bring it into the foreground

Logs can be found here: %LocalAppData%\JC4MP\logs

You'll probably want JC4MP.log.

Because you're seeing a suspended JustCause4.exe process, it's likely failing to load the client into the process

The launcher also never exits - it minimizes to tray when launching JC4MP

If you have any luck please let us know!

Yeah I'm also on Arch-based distro, would be real happy to see if and how it works

Mine is failing to setup Microsoft Edge Webview2...

okay I changed to a later proton/wine version, I think it has to be later or at least Wine 9.x based 🤔

now launcher is running, downloading version 1.0.6

yeah managed to install webview2 on Proton experimental, launcher got stuck downloading latest version of mp I guess, retrying

now the launcher loaded news, but nothing else <:thenking:444325544931229696> I'll give it a moment I guess

I'm using proton-cachyos, and running the launcher within the same prefix as JC4 (using Protontricks) and it sets up perfectly fine, and the whole launcher works except for actually launching the game, because it launches the game justcause4.exe with the proton version of steam putting it in the background and not in an actual window i can see/hear/interact with

okay hmm

I'm on CachyOS if that's of any relevance btw..

yeah same, imma try the proton-cachyos to see if there's any difference

could try it through bottles maybe?

yeah I'll try

also, when you actually get it running, the mouse may be bugged and not display over the window, temporary fix could be done using the KDE Shake cursor accessibility feature (just to see what your actually clicking), for some reason it makes the mouse display over literally anything

well, I'm on Niri so I do see the cursor, at least in the launcher

when I had the launcher running

lucky, Id' love to use a tiling window manage but I just don't have the time (or know how) to setup all the configs etc

can't figure out how to add existing folder as a bottle though

I'm gonna try bottles rn,

I'm fine with my Niri being mostly defaults, they've got nice defaults