No, you can't use the application on the 2015 iMac because it doesn't support this operating system. According to various websites, this version of VersaCheck can be installed on the following Windows releases: Windows 7, Windows Vista, Windows XP, Windows Me, Windows 2000, Windows 98.
As you can see there is nothing mentioning Macs. However, you can try using Wine Bottler, an application that allows users installation of Windows apps without having the actual OS installed.
You can give it a go using the following link: http://macdownload.informer.com/winebottler1/