"Runtime update not available" when installing AIR on XP

[2011-04-09:10:54:04] Runtime Installer begin with version 2.6.0.19120 on Windows XP x86
[2011-04-09:10:54:04] Commandline is:
[2011-04-09:10:54:04] No installed runtime detected
[2011-04-09:10:54:06] Starting runtime install. Installing runtime version 2.6.0.19120
[2011-04-09:10:54:06] Installing msi at c:\docume~1\myusername\locals~1\temp\air109.tmp\setup.msi with guid {AFF7E080-1974-45BF-9310-10DE1A1F5ED0}
[2011-04-09:10:54:10] Launching subprocess with commandline c:\Program Files\Common Files\Adobe AIR\Versions\1.0\Resources\Adobe AIR Updater -installupdatecheck
[2011-04-09:10:54:10] Runtime Installer end with exit code 0
[2011-04-09:10:54:11] Runtime Installer begin with version 2.6.0.19120 on Windows XP x86
[2011-04-09:10:54:11] Commandline is: -installupdatecheck
[2011-04-09:10:54:11] Installed runtime (2.6.0.19120) located at c:\Program Files\Common Files\Adobe AIR
[2011-04-09:10:54:12] Performing pingback request
[2011-04-09:10:54:12] Pingback request completed with HTTP status 200
[2011-04-09:10:54:12] Starting runtime background update check
[2011-04-09:10:54:12] Begin Background update download from http://airdownload.adobe.com/air/3/background/windows5.1/x86/patch/2.6.0.19120/update
[2011-04-09:10:54:12] Unpackaging http://airdownload.adobe.com/air/3/background/windows5.1/x86/patch/2.6.0.19120/update to C:\Documents and Settings\conlinc\Application Data\Adobe\AIR\Updater\Background
[2011-04-09:10:54:12] Runtime update not available
[2011-04-09:10:54:12] Unpackaging cancelled
[2011-04-09:10:54:12] Runtime Installer end with exit code 0