Avoid any site offering "Office 365 Portable Highly Compressed" – these are almost always vectors for malware. No legitimate source provides this.
Security risks
A portable Microsoft Office 365 highly compressed UPD is a specially designed version of the Office 365 suite that has been optimized for portability and convenience. This version is highly compressed to reduce its file size, making it easy to store on a USB drive or external hard drive. The UPD (updated) version ensures that the software is up-to-date with the latest features and security patches, providing users with a seamless and secure experience. portable microsoft office 365 highly compressed upd
If you need to use Office without a full local installation, Microsoft provides several official, secure methods: Use the Office offline installer - Microsoft Support Avoid any site offering "Office 365 Portable Highly