How does this error from dub mean "dlang Non-selected Y package is available with version X"?

[Marc]

the warning is:

> Non-selected package lnk is available with version ~>0.2.1.

What does it mean by *Non-selected* package lnk is available?
from what I could tell from the page, it's highest version.
But I've tried low versions anyway to see if it Works 0.2.0, 
0.1.1 etc and none did.

I noticied I put "lnk": "~>0.2.1" on cachedUpgrades section so I 
moved there to just created "dependencies" section then the dub's 
error is gone but it fail to find the lnk library:

> Error: module lnk is in file 'lnk.d' which cannot be read

some info:

The package I'm trying to include is: 
https://code.dlang.org/packages/lnk
DUB version 1.5.0, built on Sep  1 2017
DMD32 D Compiler v2.076.0
Windows 10/64bit

What am I missing? I'm new to dub so everything is new to me, by 
now.