??? I do not know what you bought. JRiver sells:
Purchase Master License $79.98 $69.98 (recommended, since it is valid for Windows, Mac, and Linux) (If you previously purchased MC for Mac or Windows, and it is installed and licensed, you will see a reduced price when you purchase a Master License.)
Purchase Windows only for $49.98 (Works only for Windows)
Purchase Mac only for $49.98 (only for Mac)
Purchase Linux only for $49.98 (only for Linux)
"Q: Can I install on more than one computer?
A: Yes, if it is the same operating system or if you have a Master License that works with all three operating systems. During the two-week period after you have purchased or restored, you can use the Install Key you received to activate the program on your other computers. You may use a single license for all you computers, within reason."