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This variant is designed to run from a USB drive without standard installation. Adobe does not officially produce or support a "portable" version of Lightroom for desktop.
Based on the Adobe Lightroom 5.4 Readme , the minimum requirements for this era of software are: : Intel Pentium 4 or AMD Athlon 64. Operating System : Windows 7 SP1, 8, or 10. RAM : 2 GB (4 GB recommended). Storage : 2 GB of available hard-disk space. Display : 1024 x 768 minimum resolution. Critical Risks and Legal Status
Version & Release History of Adobe Lightroom - Greater Than Gatsby