If you are an old user of Office 365 suite and already have an Office setup product installed on your device, the go to office.com/setup and sign in your account and update your subscription. If you’re a first time user, and don’t have a Microsoft account, then create one and follow the given instructions
1 - Go to the Office.com/setup and sign in your MS Office account 2 - Enter the product key in the given field 3 - Download the purchased Office 365 suite 4 - Install the program by following onscreen instructions. Now, you have seen the whole process of installing and activation Office Setup via Office.com/setup. Still, it is probable that some of you may end up facing installation failure due to system incompatibility issues. In this case, you can always ask for help on toll-free number of customer support services while installing or using Office 365 suite.