The product is packaged as a single downloadable ".dmg" disk image named as "Oberon Workstation.dmg". Installation amounts to just copying the program to your "Applications" folder, or - if you prefer - to another folder, e.g. your ~/Applications/ folder in the home directory.
Open the .dmg file by double-clik. macOS will ask you confirmation for opening a downloaded item. Click "OK".
The disk image will display a covenient graphic folder panel, like:
Follow the instruction to drag Oberon.app to your Applications folder. If there is already an old version of Oberon in your Applications you can overwrite it (but see below: "Removing the free App-Store Oberon application").
You may have to type your Administrator password to allow the copy. After installing in the Application folder the disk image can be unmounted/ejected. You can keep the .dmg file to install on your second computer or as a backup.
Before installing Oberon Workstation, it is recommended to remove the pre-existing free Oberon Application downloaded from the Mac App Store, if present.
This is accomplished easily by using Apple's "Launchpad" application: locate Oberon, press and hold untill the icons start "jiggling" a-la iPhone, and click the little cross on the old Oberon icon.
Your present Oberon folder(s) are not affected and will keep working, but your settings from the free Oberon application have disappeared. It is a good idea to refresh the Oberon system files in your folder(s) by using "Files > Restore System" when you start working with the new Oberon program (unless you have purposely changed your Oberon system).
Open Oberon Workstation by a double-click on its icon. Upon first use, you may see a warning, depending on your security setting in macOS. We recommend to use "Allow apps downloaded from App Store and identified developers" in the "Security & Privacy" settings panel of your Mac's system prefs. Confirm that you want to open the App.
The Oberon Workstation app requires the License Key that you have obtained from Paddle.com by email. Enter the License Key (conveniently copy/paste it from your email) and click "Done".
To start the Workstation, you need at least one directory that is dedicated to your Oberon work, and that will receive the Oberon System files. If you have no existing Oberon folders, or want to create a fresh new one, use the file/folder dialogue that is automatically displayed. This panel creates a new folder: you should type a new name or accept the default "Oberon" after navigating to the parent folder in which you want to create the new Oberon folder.
If you have an existing Oberon folder, cancel the new-folder dialogue, and use "File > Set Oberon Folder..." to select any existing Oberon folder.