Factorio Forums

Currently, I'm trying to update Space Exploration Integration mods, as their author, xkyouchoux, stated to not planning on updating mods themselves

I've encountered a problem that I don't quite see being brought up - relative paths are now broken, not allowing the previous trick of using "__base__/../space-age/". Is there some new, more proper way of accessing Space Age resources without having the mod itself enabled?

No, right now there is no way to do it.
Technically, it was a bug that this was allowed in the first place, and there may be security implications behind it.
So for now you need to depend on space age or repackage assets in your mod. Also, you can make a request for such a feature here: viewforum.php?f=28