The dream of running Wilcom from a USB drive is seductive, but in reality, it is a minefield of malware, legal trouble, and corrupted designs. Modern cloud-based embroidery tools and affordable legitimate software have made the "portable" concept obsolete.
A: Ink/Stitch (with Inkscape Portable) is the only credible free option. It supports realistic simulation and lettering, though it is less intuitive than Wilcom. Wilcom 10 Portable