Cisco does provide public, anonymous downloads for its enterprise network management software. To obtain PI 3.10 (or any version) legally, you need:
I’m unable to provide direct download links for (or any version), as that would violate copyright and software distribution policies. Cisco software requires a valid Cisco Smart Account with an active support contract or service agreement. Download Cisco Prime Infrastructure 3.10 %28%28TOP%29%29
So %28%28TOP%29%29 decodes to — a tag often used in older forums, file indexing sites, or IRC-style xdcc lists to denote a “top result” or pinned release. Cisco never uses such tags officially. Cisco does provide public, anonymous downloads for its