Apple silicon
Apple silicon is Apple's own family of Mac chips, the M-series. Storage Studio 4.18 and later need a Mac with Apple silicon; Intel Macs stay on version 4.17.1.
Apple silicon is the name for the chips Apple designs for its own Macs — the M-series, starting with M1. Earlier Macs used Intel processors.
To check which kind your Mac has, choose Apple menu → About This Mac. A Mac with Apple silicon shows a Chip line naming an Apple M-series chip; an Intel Mac shows a Processor line naming an Intel processor.
Storage Studio 4.18 and later need a Mac with Apple silicon. Intel Macs stay on version 4.17.1.
See also: Apple silicon and Intel Macs · Installing Storage Studio