Help!!!! I am downloading word for Mac from my school and the installer program froze

Help!!!! I just bought my Mac earlier today and I began to download a free copy of Word for Mac. The download went great, but the installation is not working. I received a pop up saying I had to close Safari in order to continue. I closed it, hit the continue button and installer froze. Now the pop up keeps blinking on and off and I have this black and white spinning wheel of death. Also the time of the installation keeps increasing. Please help!