Too late a response (sorry, I've been away for a while, for various reasons):

1. QRC is the replacement for Assura RCX. It's based on the same technology, but has merged in the Fire & Ice cell-level extractor, uses common technology data, and QRC is the maintained and developed tool; Assura RCX only lives on in legacy support mode.
2. Yes.
3. You need the LVS results, and additional data files produced from a process stack. This is covered well in the documentation, so I suggest you read that.

Best Regards,

Andrew.