Is the Content Porter not released in SDL Web8 cms ? What are the options to migrate the content (components, pages, CT, PT etc) from Dev-CMS to QA-CMS Environment if content porter is not available in SDL Web8.
Check your installation Media for Web 8. You should have this:
Run the intaller, then look for the icon the CME Tools section. Click it to install the client.
If you have downloaded and ran CP 8 before and if the icon just does not appear in the CME, clear the browser cache then refresh and look for it again.