I'll guess you have installed the LTSpice and it's working. Right now I'm sitting in front of a Mac a couple of days ahead and I don't remember exactly how you should do but look after simulation and "RUN".
Also something to consider is if you swap
opamps in a working circuit and the offset adjustment is being used,
the LF411 offset adjustment pins connect to the negative supply and
opamps like the OPA227 offset adjustment connects to the positive supply.
