One quick check, then it's yours.
The installer is tied to your license, so the page needs to know which one. Type the email address your NinjaTrader account is under and the download starts on its own.
Your browser may ask you to keep the file — that's normal and safe.
Once it's downloaded, double-click CFTPT_Setup.exe to unpack the toolbox — it drops the importable package into your Downloads folder.
First install? Follow the Setup & Install guide to import it into NinjaTrader 8 and restart.
Updating an existing install? Remove your current toolbox assembly and restart NinjaTrader before you import the new one — the update guide has the full steps.