This looks like a fragment of a coded or encrypted message, possibly using a simple substitution cipher (like Atbash, Caesar, or a keyboard shift).
Given the impossibility of solving without more info, my best guess is the author used to obscure a phrase like "open the file..." or something similar, and "Download-" is plaintext indicating the action.
The phrase "Download- nwdz lshrmwtt khlyjyt fatht layf ttshrmt..." appears to include an English word "Download" at the start, followed by what might be the result of a cipher applied to an instruction or filename. Download- nwdz lshrmwtt khlyjyt fatht layf ttshrmt...
nwdz ROT13: a→n, b→o, but wait, do it properly: n→a, w→j, d→q, z→m → ajqm (no). Actually ROT13: n→a, w→j, d→q, z→m — yes, ajqm . Doesn’t look like English filename.
Right shift: n→m, w→e, d→f, z→/ → mef/ — maybe part of a path. This looks like a fragment of a coded
Let’s try Atbash on lshrmwtt : l→o, s→h, h→s, r→i, m→n, w→d, t→g, t→g → ohsingdg — doesn’t look right.
Given the presence of "Download-" in plaintext, the rest might be the same cipher applied to a filename or URL. Possibly it's a keyboard shift where each letter is replaced by the key to its left/right on QWERTY. nwdz ROT13: a→n, b→o, but wait, do it
But since you labeled it — paper , this might be a snippet from an academic paper where the authors used a toy cipher to hide a message. Without more context, the most common simple cipher for such puzzles is (because it’s reversible and produces pseudo-gibberish).