As per the GO! platform’s current design, from a “component availability” perspective, there are 2 main categories:
Direct downloadable content: items that can be directly downloaded from the platform - either free downloads or paid downloads [available with the monetization phase expected as of Q1 2019]
Leads (Solution): to be seen as advertisements. These items are not directly downloadable as the consumers will need to fill a form which will send a request directly to the Producer/Vendor. Producer/Vendors can use them for advertising purposes.
As Maciej was pointing out, in case you are interested on a specific Solution, you will have to submit an Enquiry by filling the appropriate form, which will be sent as a notification to the Solution’s author.