You have to update to TWRP 3.2.3-0 because of an zip verification bug.
Similar problem: https://forum.fairphone.com/t/cant-install-open-gapps-on-18-10-0-fp-open/44766/4
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You have to update to TWRP 3.2.3-0 because of an zip verification bug.
Similar problem: https://forum.fairphone.com/t/cant-install-open-gapps-on-18-10-0-fp-open/44766/4