Good news: You do not need to risk malware. Here are four legitimate ways to achieve the same goal—using Office on any computer, anywhere.
Office is a massive suite of interconnected libraries. When virtualized into a portable package, the connection between the software and the OS is emulated. This leads to frequent crashes, especially when handling large Excel spreadsheets or complex Word documents with heavy formatting. microsoft-office-2019-portable
Office relies on Visual C++ Redistributables. If the host computer is a fresh Windows install missing these runtimes, a true portable version would need to load them dynamically without installation. Most repackaged versions fail here, crashing with "VCRUNTIME140.dll missing" errors. Good news: You do not need to risk malware