Assuming you have obtained a legitimate ISO or CD for Version 15, here is how to install it on modern Windows (using compatibility mode):
DacEasy Version 15 is abandonware —meaning the original publisher (now Sage) no longer sells or supports it. However, "abandoned" does not equal "public domain." Sage still holds the copyright. Downloading it for free is technically software piracy, though no one has been prosecuted for downloading a 20+ year old accounting program. Daceasy Version 15 Free Download
