Hello there,
The most recent VM-based installation of CDH, called Cloudera QuickStart VM (not sandbox) was based on CDH 5.13, and was outdated and nearing the end of support, so it is no longer available for download. Just going on the information available on this page, (scroll down to Exam delivery and cluster information), it looks like CCA175 is based on CDH 6.1.1, which is much more recent. You can download CDH 6.1.1 by using this page.