OFFICE.COM/SETUP
Microsoft Office installed on the same system. Here's how to do this: 1- You must first install the oldest Office version (for example, Office 2010 should be installed before Office 2013 or Office 2016). This also applies to standalone Office programs (Word and Excel) 2- After installing the oldest MS Office package, start installing the second version. 3- Click on "Customize" in the window "Choose the type of installation"
Office Setup Guide office.com/setup: Microsoft does not recommend installing multiple versions of an Office product, but it is usually possible to install and use more than one version of Office on a single Windows computer. For example, you can install and use Office 2010 and Office 2016 on the same computer.
MS office customer support:
Recover lost files Troubleshoot & repair Microsoft office Fix issues related to crashing, no response, Fix problems with office data base Installation & configuration
www.office.com/MyAccount
Microsoft office customer support
However, you can easily fix those Microsoft office problems by touching with office.com/setup experts to solve issue in a minimum time period.