wyupdate -updatepath/-server local file location issue

There may be a bug here, or it may be something I did wrong, but wanted to put this out there in any case.

I had built previous versions of my program and uploaded the updates to an Amazon S3 server. The only download site specified in the wyBuild project was that server (https://server.com/directory/%file%).

I have just added %updatepath%/%file% as the second entry in the download sites, so that I can test with offline updates without having to upload them to the server and make them public. While the instructions for offline configuration indicate that the first download site be marked as "Just a server site", I left mine as "Both server & update site" (although it turns out this didn't matter). I marked the %updatepath%/%file% entry as "Just an update site".

When attempting the offline update, I copied the update files to my host's D drive, under D:\Temp\2. In the virtual machine containing the program I wanted to try updating (that also maps D to my host's D drive), I brought up a command prompt, and changed into the directory of my program, which is in the root of the C drive:

cd \"my program"

Then I entered the wyupdate command:

wyupdate -updatepath="file:///d:/temp/2" -server="file:///d:/temp/2/wyserver.wys"

The updater window appeared, and after a while it gave me the list of updates to the latest version. I told it to proceed, at which time it ultimately errored out with:

Error trying to save file: Error downloading "file:///d:/temp/2/myprogram.1.1.0.to.1.3.0.wyu": Could not find a part of the path 'd:\temp\2\myprogram.1.1.0.to.1.3.0.wyu'.

Fought with this for a long time. Finally got the idea to copy the contents of D:\Temp\2 to C:\Temp\2 just to see if it was an issue with "seeing" files on a different drive, then reissued the wyupdate command correspondingly:

wyupdate -updatepath="file:///c:/temp/2" -server="file:///c:/temp/2/wyserver.wys"

This worked.