You have to have Magisk installed and working first as EdXposed and other items are technically Magisk modules.
Once Magisk is up and running you can install riru-core and one of the EdXposed offerings straight from Magisk Manager in separate steps. Or of course by flashing the zips. Just do one thing at a time and safely.
- Flash/install Magisk. Make sure it works.
- Install riru-core. Reboot.
- Install EdXposed, Yahfa or Sandhook. Reboot.
- Install EdXposed Manager app. From there you’ll see if EdXposed is enabled and working.