Yes, that is what the IPS system can let you do.
Without knowing what the errors were, its hard to say what the problem might have been. If its a fresh install, I'd try reinstalling it.
Since I don't know the extent or type of modifications you are talking about, it's hard for me to say. I would think you could use them, but you may or may not have to make some changes depending on what your mods were.
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