You're talking about different solutions, not the same solution. You purchased the solution suite, which contains all our solutions. The PowerStore files you've already uploaded. You would most likely want to create a separate directory to put the PowerGallery110 files and another one for the CMS102 files.
For the other 2, take a look at the support files to see how you can incorporate them into an existing site:
contact-form/
user-registration/
There are useful guides on the rest of the solutions on the support pages as well:
support/