AppleShare IP 5.0.3 provides support for Mac OS 8.1 and volumes formatted with Mac OS Extended format, also referred to as HFS Plus. Earlier versions of AppleShare IP are not supported with Mac OS 8.1, and therefore do not support Mac OS Extended formatted volumes.
For customers using earlier versions of AppleShare IP, updaters are available on Apple Software Updates.
If you own Mac OS 8.0, you can find the updater to Mac OS 8.1 on Apple Software Updates.
This article can help you locate the software update mentioned here: