Espresso Reader: Migration signature validation failed

Hello

I would like to install EspressoReader on Windows7 64 bit viaAodbe Air. I get the following error in the AdobeAir log file:

[2013-02-04:13:48:52] Application Installer begin with version 3.5.0.1060 on Windows 7 x86

[2013-02-04:13:48:52] Commandline is: C:\Users\rka\Desktop\EspressoReader_0_9_8.air

[2013-02-04:13:48:52] Installed runtime (3.5.0.1060) located at c:\Program Files (x86)\Common Files\Adobe AIR

[2013-02-04:13:48:52] Unpackaging file:///C:/Users/rka/Desktop/EspressoReader_0_9_8.air to C:\Users\rka\AppData\Local\Temp\fla5CC4.tmp

[2013-02-04:13:48:53] Migration signature validation failed

[2013-02-04:13:48:53] Got an unexpected fatal error while unpackaging: [ErrorEvent type="error" bubbles=false cancelable=false eventPhase=2 text="invalid migration signature" errorID=5023]

[2013-02-04:13:48:56] Application Installer end with exit code 7

What is wrong with this installer? Thanks for any tip.