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PSA: there is a beta update available to the Core module that fixes most of the issues with D&D 3.0 system.
You can get it by installing directly from manifest: https://github.com/FLPub/symbaroum5ecor ... odule.json
Note, that it's an update to a "system" module, not RoS content modules (PG, GMG, Bestiary) - those are still very outdated and have issues.

Honestly, if Free League is worried about the cost of contracting a developer, I would volunteer to update it myself for free. It is not that much work:
[1] Update classes to use the new automatic advancement system (leveling).
[2] Update races to use a new dedicated race item type instead of being a "feature".
[3] Fix icon paths for spells and features (5e system changed directory for icons).
[4] Updated journals to use new enrichers.
[5] Organize content into folders (a new built-in Foundry feature).

News on this:
There an updated version of the Core RoS for foundry
https://foundryvtt.com/packages/symbaroum5ecore
It supports Foundry V12 and dnd5e v3.3.0+ only (NOT 4.x)

Still no update for the "premium" modules:
- https://foundryvtt.com/packages/symbaroum5eplayersguide (last update 1 year ago) works only with Foundry v11 and DnD 2.3
- https://foundryvtt.com/packages/symbaroum5egmguide (last update 1 year ago) works only with Foundry v11 and DnD 2.3
- https://foundryvtt.com/packages/symbaroum5ebestiary (last update 1 year ago) works only with Foundry v11 and DnD 2.3

I deeply regret buying those modules.

For what I gather, they basically need to be rebuild it for the ground-up, and the original author who devlopped the module ( on version 9 d&d 2.0, as 10 and 3.0 was very close to be out) state it was working as is with previous version and was good enough as is, and later on made a few updates ( core convertion for 3.0 dd, version, juste when 4.0.0 dd came up a short few months after) and are now too busy to commit to it . They say they were working on a passing over to other devlopper, have it updated, fully fonctionnal 4.0.0 and sustaining all fututre maintenance/modules. Now as to when, is anyone guess. My understanding, for Foundry Modules, there is no professional working on it, but it's side-job for professional programmer, so it can be difficult to time-manage; and Alchemy does all the module development internally. Here hoping we get something in 2025...

Ok, so having the quickest look at the code of how a module is created I made a quick hack to "module.json", so that it at least is possible to enable it in my ongoing campaign. It probably will create a bunch of other issues down the line, this isn't fixing the actual problem, only the symptom, but if anyone else is desperate it might be worth it whilst knowing those trade-offs.

Open the module.json (in the root folder of the module, wherever you have your modules, mine was in "C:\Users\mathi\AppData\Local\FoundryVTT\Data\modules\symbaroum5ecore" on a Win machine) and change the value of "compatibility" (far down in the file) "maxiumum", which has a value of "2.9.9". Change the "2" to a "3", so it says "3.9.9".

It pretty much says that the module is compatible up to that version. Basically lying. But hey, now I can open my world and at least see the content. We will be forced to do todays gaming session completely analogue though as I don't trust all calculations and other tweaks are correct, but now I can at least show the maps I have drawn in Dungeondraft and imported in to FoundryVTT, on the TV we have on our gaming table.

Also, as long as the core module is enabled you can now again go in on every token and pick the correct character sheet, i.e. the old one, which has corruption etc on it.

The downside of doing it like this is that you will not get a notification for when the core module ACTUALLY is updated, as in properly updated, but as that seems highly uncertain right now it might be worth setting a reminder for checking that manually until then, and just keep gaming in the meantime.

...let's see what 2025 will bring... not holding my breath, but hoping.