My AVIRA FREE ANTIVIRUS v14.0.1.719 is detect the installer of PortableApps.com_Platform_Setu.exe as TR/Crypt.XPACK.Gen Trojan????
Starting the file scan:
Begin scan in 'E:\Temp\DwnlData\Amirul\PortableApps.com_Platform_Setu_4480\PortableApps.com_Platform_Setu.exe'
E:\Temp\DwnlData\Amirul\PortableApps.com_Platform_Setu_4480\PortableApps.com_Platform_Setu.exe
[DETECTION] Is the TR/Crypt.XPACK.Gen Trojan
Beginning disinfection:
E:\Temp\DwnlData\Amirul\PortableApps.com_Platform_Setu_4480\PortableApps.com_Platform_Setu.exe
[DETECTION] Is the TR/Crypt.XPACK.Gen Trojan
[WARNING] The file was ignored.
End of the scan: Thursday, November 21, 2013 01:45 [GMT+8:00 Kuala Lumpur]
Used time: 00:20 Minute(s)
The scan has been done completely.
If you downloaded it from our site and not a random 3rd party download site, it's definitely a false positive in Avira. Please report it to them. Avira is pretty notorious for false positives. And considering that the installer you're using is known clean, digitally signed, and was built and signed over 11 months ago, it's definitely an issue with Avira again. Unless something else on your system infected it as soon as it was downloaded.
Sometimes, the impossible can become possible, if you're awesome!