If you have HFS+ drive attached to PC during Paragon HFS+ for Windows product installation, you may experience the Windows format prompt for this drive.
Just cancel the prompt and finish the installation, it does not affect functionality of the product. Once installation is finished Paragon HFS+ for Windows will recognize attached HFS+ drives and you may start work with them.
During the installation process, several driver components are being installed to your system. In some cases, the system is trying to recognize your HFS+ drive, but since driver is not yet fully installed, Windows decides it is unrecognized and prompts format. Once the product is fully installed, Windows starts to recognize HFS+ drive.
NOTE: Do not accept the format prompt except the case when you need the format. Otherwise Windows formatting will be executed on the drive and all data on the drive will be wiped.