Use Timed Mode early on to simulate exam pressure (40 questions in 60 minutes).
UWorld does allow a form of downloading—their desktop app (for Windows/Mac) installs locally. But it requires an active internet connection every 5–15 days to re-authenticate your subscription. Cracked versions claiming to bypass this are almost always broken by the time you install them because UWorld constantly updates their encryption. uworld step 2 ck download