Ammar sent me a zip file with a shell script.  I was able to manually install the trial.  The pkg still does not work on my system.  Feel free to contact me if you come up with a solution.

Hello Caylan,

I have been contacted by Ammar informing me that you were successfully able to install the trial. At this time if you have any further questions or concerns do not hesitate to ask. Thanks again.

No change.  So strange... I have a project I'd like to start working on, so please consider this a high priority.  I'm available via Skype to troubleshoot this.

Can you try 

chmod -R 777 /Developer

I've verified/repaired permissions - still shows error

I ran "chmod -R go+w /Developer" - still shows error

I'm available for Skype screenshare with you if you would like to see this first hand.

The package looks good as far as pkgutil is concerned:

$ pkgutil --check-signature Infragistics_NucliOS_2013_2_Trial.pkg
Package "Infragistics_NucliOS_2013_2_Trial.pkg":
Status: signed by a certificate trusted by Mac OS X
Certificate Chain:
1. Developer ID Installer: Infragistics Inc. (U95M7FTV2B)
SHA1 fingerprint: C3 00 07 39 E6 EF B0 C4 26 BF 11 F4 DE 55 6F 30 96 F8 75 1D
-----------------------------------------------------------------------------
2. Developer ID Certification Authority
SHA1 fingerprint: 3B 16 6C 3B 7D C4 B7 51 C9 FE 2A FA B9 13 56 41 E3 88 E1 86
-----------------------------------------------------------------------------
3. Apple Root CA
SHA1 fingerprint: 61 1E 5B 66 2C 59 3A 08 FF 58 D1 4A E2 24 52 D1 98 DF 6C 60