Given “mask” is in there, maybe it's just a red herring or coded instruction. Could it be a simple (Caesar cipher)?
Given the puzzle context, without a key, the simplest answer: Download- mharm dywth khlyjy mask ly akhth nwdz ...
Word 1: m (left of m = n) h (left of h = g? Actually left of h is g, but that’s not right — wait, h’s left on QWERTY is g? No, row: q w e r t y u i o p, then a s d f g h j k l, then z x c v b n m. So h is in middle row, left of h is g) — but that yields “ng...” That doesn’t match. Let’s test a different approach. Given “mask” is in there, maybe it's just