You can download a portable version of QGis 3.44.0 from this link
The compressed file is 1.2 GB. Once decompressed, it will occupy 2.91 GB on disk.
What is a portable application?
A portable application (or portable software) is a computer program characterized by its portability, i.e. its ability to run in different execution environments. It requires no prior installation, does not depend on external components, and does not cause any lasting modification to the system through its operation.
These applications are useful for working on a computer whose security policy does not allow installations, or for avoiding lasting modifications to a computer used temporarily. The application can then be used from a removable storage device such as a USB key.
Instructions for use
Download the .7z file.
Unzip it onto the desired medium: USB key, external disk, PC directory. The only requirement is that you have read and write access to the directory created: /QGIS 3.44.0
To run QGis, double-click on the file \launch_qgis_portable.bat
That’s all there is to it!
Plugin installation
The downloaded version works in the same way as the installer version: the plug-ins are installed in a directory under the key: \QGIS3.44.0\QGIS_PROFILE
If you want to take the plug-ins with you from your PC, as well as all QGis customizations, you’ll need to copy the C:\Users\user_name\AppData\Roaming\QGIS\QGIS3\profiles directory into this key directory: \QGIS3.44.0\QGIS_PROFILE\profiles
