Given the difficulty, maybe the cipher is for the whole string:
That gives "ncmhroo" — not English either. Download- shrmwtt tjyb shyqha ydklha ksha wkhrm ...
Actually simpler: try (shift +13):
s (19) +13 = 32 mod26 = 6 → g h (8) +13 = 21 → v r (18) +13 = 31 mod26 = 5 → e m (13) +13 = 26 mod26 = 0 → a w (23) +13 = 36 mod26 = 10 → k t (20) +13 = 33 mod26 = 7 → h t (20) +13 = 7 → h Given the difficulty, maybe the cipher is for