Download- Byhss Ly Tyz Mhjbt — Msryt Fy Alatwbys...

If “alatwbys” original intended = “alautobees” → “alatwbys” shift +1: a→b, l→m, a→b, u→v, t→u, o→p, b→c, e→f, e→f, s→t → “bmbvupcfft” no.

Better approach: Maybe they encoded English words by shifting each letter by +1, but the phrase “Download-” is plaintext. Then “byhss” shifted back 1 → “axgrr” — nonsense. Download- byhss ly tyz mhjbt msryt fy alatwbys...

Wait — what if “Download-” is just a header and the rest is a cipher: Ciphertext: byhss ly tyz mhjbt msryt fy alatwbys Download- byhss ly tyz mhjbt msryt fy alatwbys...

Given the rest of the phrase “ly tyz mhjbt msryt fy alatwbys…” — could be Arabic written in Latin script? “fy” = “في” (in), “alatwbys” = “الأتوبيس” (the bus). Yes! This looks like (Caesar cipher). Let's verify: Download- byhss ly tyz mhjbt msryt fy alatwbys...

But maybe it's Atbash (A↔Z, B↔Y, etc.)?