installer file is damaged

I have installed adobe air(version: 24.0.0.180) in my pc. Then i have tried to install air application. but showing this below message

"The application could not be installed because the installer file is damaged. Try obtaining a new installer file from the application author."

Here is my installation log file:

[2017-03-01:15:03:34] Runtime Installer begin with version 24.0.0.180 on Windows 7 x86

[2017-03-01:15:03:34] Commandline is:

[2017-03-01:15:03:34] No installed runtime detected

[2017-03-01:15:03:37] Relaunching with elevation

[2017-03-01:15:03:37] Launching subprocess with commandline c:\users\kabbojsr\appdata\local\temp\aire82d.tmp\adobe air installer.exe -ei

[2017-03-01:15:03:39] Runtime Installer begin with version 24.0.0.180 on Windows 7 x86

[2017-03-01:15:03:39] Commandline is: -stdio \\.\pipe\AIR_3428_0 -ei

[2017-03-01:15:03:39] No installed runtime detected

[2017-03-01:15:03:39] Starting silent runtime install. Installing runtime version 24.0.0.180

[2017-03-01:15:03:40] Installing msi at c:\users\kabbojsr\appdata\local\temp\aire82d.tmp\setup.msi with guid {63B5DA5A-477B-438D-A6A0-118787A4C71B}

[2017-03-01:15:03:43] Runtime Installer end with exit code 0

[2017-03-01:15:03:43] Elevated install completed

[2017-03-01:15:03:45] Launching subprocess with commandline c:\Program Files\Common Files\Adobe AIR\Versions\1.0\Resources\Adobe AIR Updater -installupdatecheck

[2017-03-01:15:03:45] Runtime Installer end with exit code 0

[2017-03-01:15:03:46] Runtime Installer begin with version 24.0.0.180 on Windows 7 x86

[2017-03-01:15:03:46] Commandline is: -installupdatecheck

[2017-03-01:15:03:46] Installed runtime (24.0.0.180) located at c:\Program Files\Common Files\Adobe AIR

[2017-03-01:15:03:47] Performing pingback request

[2017-03-01:15:03:47] Failure during pingback request: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032" errorID=2032]

[2017-03-01:15:03:47] Runtime Installer end with exit code 0

[2017-03-01:15:04:29] Application Installer begin with version 24.0.0.180 on Windows 7 x86

[2017-03-01:15:04:29] Commandline is: "D:\Web Development Softwares\Crunch.1.9.3.air"

[2017-03-01:15:04:29] Installed runtime (24.0.0.180) located at c:\Program Files\Common Files\Adobe AIR

[2017-03-01:15:04:30] Unpackaging file:///D:/Web%20Development%20Softwares/Crunch.1.9.3.air to C:\Users\kabbojsr\AppData\Local\Temp\flaD9C1.tmp

[2017-03-01:15:04:37] Package signature validation failed

[2017-03-01:15:04:37] Got an unexpected fatal error while unpackaging: [ErrorEvent type="error" bubbles=false cancelable=false eventPhase=2 text="invalid package signature" errorID=5022]

[2017-03-01:15:04:50] Application Installer end with exit code 7

How can i fix this problem?

kindly help please