A "portable" app is traditionally a software program designed to run without being installed on the host operating system. Users often look for these because:

Because Adobe does not officially release "portable" versions of InDesign, any file found with this description is a created by third parties. This introduces several risks:

If you only need the software for a short-term project, Adobe offers a 7-day free trial of the latest version of InDesign.

For simple layouts, Adobe offers a free, web-based version of their design tools that requires no installation.

A one-time purchase alternative to InDesign that is highly professional, lightweight, and often goes on sale for a fraction of the cost of a Creative Cloud subscription.

While the version might seem like a quick fix for a design emergency, the high risk of malware and system instability makes it a dangerous choice. For a reliable and secure experience, it is always best to stick to official Adobe distributions or reputable open-source alternatives.