Officially, Microsoft has never created a portable version of any Office suite. So, how do these files exist? They are created by third-party individuals who take a legitimate Office installer, repackage it, and use cracks to disable the activation requirement. The software you are downloading was never intended to be used in this way by Microsoft.
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Even with the severe risks, if you decide to proceed, there are ways to minimize the danger. First, run the software in a secure, isolated virtual machine or a sandboxed environment. This creates a barrier between the cracked software and your main operating system. You should also use a dedicated, lightweight antivirus program to scan each downloaded file part before attempting to extract or run any executables. It is also critically important to download from sources that have user comment sections; check for recent comments regarding malware or broken links. However, the Internet Archive has also hosted some versions of this software, though its safety cannot be guaranteed with closed-source programs that have been modified. Officially, Microsoft has never created a portable version