There are good alternatives to this mod (e.g. until it's get fixed):
1. The new game option called "Heavy Wounds" (since 1.5). Its severity can be fine-tuned using Lucjan's "Custom Advanced Settings" mod. (By default, it is not so "hardcore".)
2. "Rato's Wound Overhaul Lite" mod

Yes indeed. The mod does work but just partially. Only the first hit/wound counts. Every other hit/wound doesn´t count anymore. The wound penalty doesn´t stack.

Anyway, is this mod really working properly for 1.4.x? (It was awesome previously.)

I tried this (only this mod on a fresh new game), and stat changes does not seem to stack. E.g. for Buns, AGI/DEX/MRK is originally 79/87/86. After 1 wound: 63/70/69 (i.e. 80%), but additional wounds did not change these values at all.

Am I right that the merc's stats (e.g. for potrait hover) should always show the modified, effective values?

@Timmeh, awesome mod, many thanks for that! It makes gunfight much more realistic. I really hated that seriously wounded enemies and mercs can run and fight almost the same way as healthy ones. :)

A suggestion: it would be nice to add an option for the default 20% penalty (e.g. with values 5%, 10%, 15%, 20%, 25%, 30%). E.g. with 15%, 3 wounds -> 61%.

Actually, it is working on my end too. Just I was expecting that the stats would show something like red numbers or with minus wehen being injured. Thanks for the mod

Seems to work fine on my end and it affects all units.
If you have any other mods that change the "Wounded" effect, you'll have a conflict and only one mod's version will be used.

How to see the mod is working? I have looked at my character stats who was wounded several times but the stats seem no to have changed at all

I dont think this works properly on NPCs at all. A legion soldier with 5 wounds and bleeding stomps my units with a full auto m14 burst from across the map, reliably, all the time. Even if they had 100 dex and 100 mrk, that should be like 40 marksmanship with all those wounds yeah? something definitely isn't right here.

Update
Added chance of bleeding when receiving wounds.
Can be configured in mod options.

@hanneshelge I made something based on your suggestion:
https://gtm.steamproxy.vip/sharedfiles/filedetails/?id=3039773370
It's not very complex, but should complement this mod nicely.

@Shuri-Sama I hadn't thought about the perks being deactivated, but that's good.
It really gets difficult when your wounded merc no longer has enough ap to use big guns and has to switch to a pistol or take cover to add up ap for the next attack.
Things can go bad very quickly if your mercs get hit.

so after using for a while must say, works pretty nice. not only stats r reduced when wounded, also the perks r deactivated (when the perk requirement is not given anymore because of decreased stats). that makes fight much more challanging and some enemy types which do aoe attacks much more dangerous (rocketeer for example)

Does it affect enemy units too, or only mercenaries?

So it´s like the Red Fog in Xcom.

I like this a lot. Would be cool to combine this with a mod that allows to heal a limited amount of wounds per unit through bandaging. Perhaps depending on medical skill, saviour and painkiller perks. This would make a good medic in the team more important.

Affects all units.

Does it affect also the enemy or just the soldiers controlled by players?

cool, more difficulty i like :D. together with ur random legion squad its definatly a new challange :D

Thanks. Let me know how it goes for you.
It's just a little mod I've been using it on the side and it's played well for me, so I've decided to share it.

Nice mod Timmeh. Will try this for sure!

This only modifies the "Wounded" status effect.
Bleeding mods should be fine as long as they don't change that specific effect.

ofc i take it. so any compatibilty problems with other mods like bleeding mods or pinned down?