Platform 15 Beta 3 (Feb 06, 2018). Please donate.
300+ real apps, *new* Emsisoft Emergency Kit (Apr 2, 2018)
Over 960 million app downloads
Norton reports this update has 'Trojan.GEN.2' and blocks the installation.
Here is the clean scan of the CDExPortable_1.84_online.paf.exe online installer: https://www.metadefender.com/#!/results/file/ZTE3MDQyMFMxTEl2TTc4QWxIeXY...
Here is the clean scan of CDex which is downloaded during installation: https://www.metadefender.com/#!/results/file/ZTE3MDQwN3IxMTVMMzRhZ0JrWVB...
As you can see all antivirus engines show both as clean. Your current version of Norton is showing a generic notification. It hasn't found a trojan, it found what its engine thinks could be a possible generic trojan. You'll have to submit a false positive report and wait for them to fix their error.
Sometimes, the impossible can become possible, if you're awesome!