Test “mask” (plaintext appears) — if “mask” is plain, then the ciphertext’s “mask” means no shift on that word, so maybe it's not a consistent cipher.
I think the intended solution is (mirror alphabet), which often yields phrases like “download- n...”. Let’s test quickly: mharm → n s z i n (“nszin”) no. Download- mharm dywth khlyjy mask ly akhth nwdz ...
If you’d like, I can try to brute-force decode it assuming it’s a Caesar shift — just let me know. Test “mask” (plaintext appears) — if “mask” is
Given the “Download” at start, the rest might be: could be a garbled command. If we try Atbash (a↔z, b↔y, etc.): m (12th letter) ↔ n (14th?) Let’s just compute: a=1,z=26, m=13 → 27-13=14 → n; h=8→27-8=19→s; a=1→26→z; r=18→9→i; m=13→14→n → “nszin” — not likely. If you’d like, I can try to brute-force
Thus, maybe it's : m’s right is , (not letter), so probably not.
Given “mask” is in there, maybe it's just a red herring or coded instruction. Could it be a simple (Caesar cipher)?