If you meant the action phrase as a title, no article is needed. But if you must insert one before “descargar” (which is a verb), Spanish doesn’t use an article there.
The term "portable" in this context refers to a modified version of the software that requires no installation. A portable application is self-contained, executable from a USB flash drive, and leaves minimal footprint on the host computer's registry. descargar office 2019 portable espanol portable laptop fixed
Es vital recordar que descargar software de sitios no oficiales conlleva riesgos graves de seguridad. Muchos archivos que se promocionan como "Office 2019 Portable Fixed" pueden contener: If you meant the action phrase as a