You may not need it. If you have Logicmaster, try selecting the project folder with SFC. When you press "F1" to try to view the program you will get a message about SFC. Ignore it and press "F10" for the print menu. Make the appropriate selections for what you want to print and print to a text file.
That's what I did. The computer with Logicmaster I used does not have SFC installed and my 3.5" floppy with SFC is unreadable.
Of course, you won't be able to modify the existing 90-30 program, but if you are upgrading to Rx3i, you won't be able to use SFC anyway.
I suggest contacting Husky to see if they have an upgrade program in place.