This is arguably the more pressing concern. Unofficial portable software packages are common vectors for malware distribution. When you download a "portable Excel 2013" from an unknown source, you are trusting that the individual who repackaged the software did not include any malicious components. Given that these packages often require disabling anti-virus protection during installation, the risk is substantial.
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A portable application is a software program that you can run without needing to install it on a computer's hard drive. All its necessary files are packaged together, typically on an external storage device like a USB flash drive or an external hard drive. The key benefits are that it leaves no traces on the host computer's registry or file system and can be used instantly on any compatible PC . This is arguably the more pressing concern