Stuffit Expander disabled

Somehow I can't unstuff compressed files using my previously installed Stuffit Expander 4.5 after installing OS 8.5 and then 8.6. on a Performa 6360 with 104 mgs RAM. Usually this means you've got an extension turned off, but after making sure I had the Stuffit engine and the stuffit power plug turned on in the extensions list it's still not unstuffing.....it decodes files, like it decoded a particular compressed file from an hqx file into a .sit file but it won't unstuff. It worked fine before which gave me the suspicion that maybe SE 4.5 won't work with 8.6 though in the read me's for it say it works in OS 8. I know stuffit classic 7.0.1 works with OS 8.6 and 9 but this performa only has(had actually...I removed it for midi purposes) a 28K modem and the browser is so outdated that you can't go on the internet with it. I can't transfer any files from my IMac unless it's on Floppy and of course the file's are too large. So I guess I'm trying to figure out how to update stuffit .....but I don't know anyone with a Mac?
Anyone out there in the Boston Area willing to download and send me a CD snail mail?