Jim,
Actually, you want to pull the PSpice model that is in the product folder. Unzip the file and use the OPA2604.lib file. It can be imported into LTSpice by following the directions from the LTSpice users forum. LTSpice will automatically create a symbol for it as well, but you will want to keep track of the pins:
NON-INVERTING INPUT - Pin 1
INVERTING INPUT - Pin 2
POSITIVE POWER SUPPLY - Pin 3
NEGATIVE POWER SUPPLY - Pin 4
OUTPUT - Pin 5
This is documented in the .lib file header as well.
This .lib file is unencrypted and can be used directly from the .zip file.
Britt