Quit Premiere Pro. Double-click Radar_mac.pkg and follow the steps. If macOS says it can't check the file, open System Settings › Privacy & Security, click Open Anyway, then open it again.
Installing Radar…
Open Premiere Pro, then Window › Extensions › Radar Panel. Paste the license key from your purchase email, then click Activate.
Radar
In Premiere, press ⌃ Control Space. Press it again, or Esc, to close. You can change the shortcut in the Radar Panel.
Select clips, type what you want, press Return. For a transition, add a number for its length in frames. ⌘ Return applies and keeps Radar open.
Video Transitions
Every preset you save in Premiere shows up under My Presets, by name, with all its effects. New ones appear on their own.
My Presets
Your key works on one computer at a time. On the old one: Radar Panel › Profile › Deactivate This Computer. Then activate on the new one.
On the activation screen, click Forgot your license key? and enter your email. Polar sends a code; the code brings your key back. Bought in Bangladesh on SupportKori? Your key is in your SupportKori delivery email, and at supportkori.com › Dashboard › My Library.
Quit Premiere Pro and double-click Uninstall Radar.command (it came with the installer). It asks whether to keep your settings.