The application doesn't appear to be available anymore. I've checked the official website and LabelWorks can't be found which means that that the software was probably discontinued. There is no possibility to download the installation package again. Even you've said that the program is from 1995 and there is a very low chance that someone still has the installation disk.
However, you can always send an email to the developers to ask them about the current status of the product: https://www.amltd.com/contact.asp?