The license for CS2 is for two machines with one user. If you have not installed on a second machine at work, you might want to install CS2 on your home machine.
As for INX format, make sure that you download the latest 3.01 build. Adobe did not change the number but issued another update in April, 05. You need this particular update to import INX
Using OSX 10.3.8 on a G4