Navigate to the local copy and run Microsoft Windows CE 5.0.msi . Do NOT run setup.exe — it triggers online re-downloading of components and can cause installation to loop indefinitely.
Web archives like Archive.org often host ISO images of "Abandonware" or legacy development tools. Look for "Windows CE 5.0 Platform Builder ISO." microsoft windows ce platform builder 50 download work
Platform Builder 5.0 is useless without Service Pack 1 (and ideally 2008 media packs) to ensure functionality with slightly newer drivers. Workflow: How to Build an Image with Platform Builder Navigate to the local copy and run Microsoft Windows CE 5