The Aster Appcenter example apps are usually provided along with the installer file. Check the directory where the installer file was placed, you should find the example apps bundle there as well. On my lab cluster it is a folder named "sample-apps":
bkqueen:/tmp/sample-apps # ls -l
-rw-r--r-- 1 root root 14861042 Apr 20 2016 2016-04-01-ExampleApps-6.00.01.01.tar
-rw-r--r-- 1 root root 937129490 Apr 20 2016 AppCenter_example_data.tar.gz
-rw-r--r-- 1 root root 951980736 Nov 8 2016 AppCenter_examples.zip
-rw-r--r-- 1 root root 3840 Apr 20 2016 setup_instructions.readme
Thanks for your quick reply Margarete. What do you mean with "install directory" ? I just downloaded Aster Express which was a zip file, I unzipped that and it does not have a sample_apps directory (or a zip file containing it). I also looked around on the Aster Queen vm ware instance, but I could not find it there either.
When Aster Appcenter is installed on a dedicated server, the Appcenter software is downloaded from Teradata internal software server (TSS). This package contains the example apps. I suppose, Aster Express is different and example apps are not provided.
I just found that example apps are also located in /data/appserver-backup folder. Not sure whether it is same with Aster Express but it is worth a look.