New download products from Native Instruments utilize the Native Instruments Downloader. After purchasing a product you will receive an email containing NI Downloader links for both OS X and Windows systems.
Internet Explorer users on Windows systems may experience an issue whereby double-clicking the NI Downloader file (located in your Downloads folder) results in a prompt to specify a program with which to open the file. This is caused by Internet Explorer removing the necessary ".exe" file extension during the initial download.
To resolve this issue, click into the file and rename it to include the file extension ".exe"
Now when you double-click the file, the NI Downloader application will be launched.