BitPim is a free Mac application that you can use to download high quality Windows applications. It has no adware or spyware, as it's only used to download and manage your applications. The program also lets you burn the files to CD or USB, so you can copy the files to any drive on your computer. It also lets you upload your downloaded applications to the BitPim website and use them right away, without having to get your hands on a real Windows license. You can also try a new application for free!
AppVeyor is a paid application that help you download and install your Windows applications, but it does this by pushing down your system files, not by downloading directly from the Microsoft servers. This means that it's safe to use as long as you don't run it as a program that has the ability to change your system settings. As far as I know, BitPim doesn't even have this feature. AppVeyor is a paid application so you have to buy it to get the download part of it. BitPim is completely free and the download portion of it is safe to use.