It is. You don't need to restart new career. It doesn't write or read anything in gamestate. It can be enabled / disabled any time. I will add a comment to mod description.

There is only one thing you should consider.
If your current career has disabled map contacts in difficulty settings, you won't see the new spoilerless contact arcs. It is recommended for this mod to have map contacts enabled to have its full features. But with map contacts enabled it is actually more challenging as it gives you actually even less information as with map contacts disabled.

So perhaps you might want to start a new career with enabled map contacts in this case.

引用自 ждун：

It is. You don't need to restart new career. It doesn't write or read anything in gamestate. It can be enabled / disabled any time. I will add a comment to mod description.

There is only one thing you should consider.
If your current career has disabled map contacts in difficulty settings, you won't see the new spoilerless contact arcs. It is recommended for this mod to have map contacts enabled to have its full features. But with map contacts enabled it is actually more challenging as it gives you actually even less information as with map contacts disabled.

So perhaps you might want to start a new career with enabled map contacts in this case.

Thanks!