When you have created your new org environment, install the latest pre-release version of PosiEd as follows:
Check the Pre-release Notes page for the latest package versions
Click on the link to open the pre-release notes
Copy the URL and append it to your primary domain name in the browser address bar as follows:
*insert ss sample
Press Enter and it will load an installation screen, similar to the one in the image.
*insert ss/image
Follow the instructions until you have successfully installed the package. These steps can also be used when upgrading a package version.