In Internet Explorer, open the official download page on iis.com (1). Click "Download this extension" (2).
Confirm the following dialog with "OK":
Follow the further download instructions and download the installation package to your hard disk.
Installing PHP Manager
Open the downloaded PHPManagerForIIS_V1.5.0.msi file.
Start the installation by clicking "Next >":
Confirm the license (1) and click on "Next >" (2):
The installation is now executed and completed without further confirmation. You can close the setup program when finished:
If you have completed all steps successfully, you can delete the previously downloaded "PHPManagerForIIS_V1.5.0.msi" file from your hard disk and continue to the next step "PHP 7.3".