If a native portable version is a strict requirement, you might consider these alternatives:
Since there is no official "NoMachine Portable" download button, follow these steps to make your own: nomachine portable download
Run the installer and, when prompted, choose a directory on your USB flash drive instead of the local hard drive. On Windows, the Enterprise Client can often be installed without administrative rights, facilitating this process. Configure for Portability: Open the NoMachine UI from your USB drive. Navigate to Settings > Player > Preferences > Folders . If a native portable version is a strict
You can create portable versions for Windows, Linux, macOS, and even Raspberry Pi. Navigate to Settings > Player > Preferences > Folders
Change the paths for configuration and connection files to point to folders on your USB drive to ensure no data is left on the host PC.