SOLVED: Mar. 25, 2015
See my "XP's Internet Explorer - no access to github as of Jan 5, 2015" message later in the thread below (Mar. 23).
An FYI for the update of:
DB Browser for SQLite 3.5.1 Portable (formerly SQLite Database Browser)
Running PA Platform 12.0.5 on WinXP-64.
Normal PA application update process would find that SQLite Database Browser had an update available - but the download failed each time over four days.
The PA update error box gave a message that "there might be a proxy server issue or server access error".
I do not run a proxy server - and all other app updates downloaded and installed successfully during this time.
RESOLUTION: Finally went to PA website and downloaded the app's PAF.exe file manually and installed it via the PA GUI.
I don't know if the problem was an incorrect download link in the automated PA app update process ... but the link on the PA website appeared to be the same.
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[Solved] SQLite Database Browser update to 3.5.1 fails via platform update