How to find FP3 pie images and how to get magisk to use them?

/e/OS Devices Fairphone
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I installed /e/OS and Magisk this way:

  1. Install /e/OS
  2. Install TWRP as described https://twrp.me/fairphone/fairphone3.html (“Fix Recovery Bootloop” was not necessary, it threw an error but the phone works correct)
  3. Flash Magisk ZIP from TWRP (no boot.img patch needed)

For OTA updates I follow this tutorial https://www.droidwin.com/install-ota-rooted-android/ (but Step 1 is not necessary with /e/OS because it does not check for unchanged boot.img but simply overwrites it). So I just begin with step 2.
I did it this way with several OTA updates and everything works correct.