Hello, my name is Pavel, and I will be supporting your case, on the root (C:\Users\user\Downloads\NXP_Kinetis_Bootloader_2_0_0\doc) you can find the documentation about the package, if you open the IDE and do the steps to import a project and select the file NXP_Kinetis_Bootloader_2_0_0 will show all the projects.

Best regards,
Pavel