For a portable version (if it worked), none of these optimizations would apply because portable builds often disable hardware encoding to avoid detection.

You searched for this specifically for a new PC. Why would you take your brand new, clean, fast machine and immediately introduce software from an untrusted source?

New PCs come with bloatware, sure. But they don't come with rootkits. Downloading cracked Adobe software voids your Windows warranty (metaphorically) and destroys your system stability.

Almost certainly yes. Defender’s real-time protection will quarantine crack executables as Win32/Crack or PUA:Win32/Keygen. You’d need to disable Defender – which is extremely dangerous on a new PC.