Apple does not sell or distribute an officially "portable" version of Final Cut Pro. Final Cut Pro is sold exclusively through the Mac App Store. It is designed to be installed on the internal hard drive of a Mac.
To address your interest in "Final Cut Pro 10.6.5 Portable," it is important to distinguish between and unofficial software packages found online. ⚠️ A Critical Warning on "Portable" Versions final cut pro 1065 portable
If you need 10.6.5 for legitimate reasons (legacy project support), you should download it via the Mac App Store under your Purchased tab. If you own a newer version, Apple allows you to download older compatible versions. Apple does not sell or distribute an officially
If you just need simple multicam editing, LumaFusion costs $29.99 once. It runs on iPads and Apple Silicon Macs and is extremely lightweight. To address your interest in "Final Cut Pro 10
Apple is slowly moving towards iCloud-based libraries and universal binaries. Within two years, we may see an official "Final Cut Pro for iPad" style workspace synced via the cloud. Until then, the hunt for "Final Cut Pro 1065 portable" is a fool’s errand.
The screen flickered once, twice, then displayed a serene, empty desktop. The 1065 was dark. Cold.