Good question. This build is old version of Microsoft 365 (Office 365 Pro Plus) and is meant for Windows 7 users. If you already have Microsoft 365 installed in your PC, you can activate it by: using email with E3/E5 licenses or using KMS. Activation by KMS already presented here in this thread. Activation by email, will be uploaded soon. So, to answer your question, no need to uninstall it. Sundan mo na lang ang activation using KMS sa taas, or if you can wait atleast 1 or 2 days, I will upload tutorial Activation by email.