My Mac OS version is OS X El Capitan, Google search results are pointing towards that this program is not compatible with older Mac version. Please kindly confirm.
I don't natively have Mac OS myself (Since I cross compile from Linux to Mac), but it should support MacOS 10.12 or later on Intel 64-bit processors. So it looks like you slightly missed the cut! (^_^); If you update to 10.12 or later, you should be ok!
I'm sorry to hear that. Sure, shoot me the prefix of your email address you used to make payment and I'll see if there is an option to refund you. You probably want to look at getting a new computer though (^_^); Just kidding!