Make sure you are using the right version.
For older versions, add to the url "/1" for SSD or "/6" for PCP.
Windows: https://static.pokercopilot.com/pokercopilot_windows_7_66_build_9725.exe
macOS: https://static.pokercopilot.com/pokercopilot_macos_7_66_build_9725.dmg