Thank you for your post.
Yes, the Store Manager is a desktop application which is intended to be used on Windows PC's only.
You can run the Store Manager on Mac, however the PC Emulator is required.
Please check the following:
http://www.parallels.com/products/desktop/
http://www.vmware.com/products/fusion/overview.html
Also in case your store is running on the dedicated web server, you can install Windows Server OS and use the Store Manager for PrestaShop on your server.