installing microsoft office on my mac
I have a Microsoft Office:mac 2011 disc which I believe allowed me to install on 5 computers. My iMac on which it was installed completely died and I want to install it on my current iMac from 2017. I have an external disc drive for the disc and when I try to install it, I see a Mac installer folder to click on and then nothing really happens after I click on it. I can see the disc icon on my desktop. When I initially tried, I got an error message telling me it could not be installed but unfortunately I didn't pay attention to the detailed reason and closed the message and tried again. I have disconnected all and reconnected in hopes the message will pop up again but it has not.
Also, can you still buy a disk to install or am I forced to do the annual or monthly subscription if I can never get this to work.
Much thanks for any advice,
iMac, OS X 10.11