This is an issue in trial activation, we are working on a fix.
To workaround please do the following:
1) Go to the directory with mapped VTune Amplifier install:
cd /Volumes/vtune_amplifier_xe_2017/Intel\ VTune\ Amplifier\ XE\ 2017.app/Contents/MacOS/../Resources/pset/activation_service32e/
2) Run the Trusted Storage initialization script right from the directory and wait for its completion:
3) Now you can run install as before and choose evaluation option. It should work now.
Let know if it helps?