I would try that now.
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First, make sure that the current TWRP version → wrp-3.3.1-0-peregrine.img on Recovery partition is installed. Finally press TWRP App “Do Not install” and restart your device.
See also → How to Update TWRP Recovery. -
As a second step copy /e/ ROM latest dev build e-0.7-n-2019112732147-dev-peregrine.zip to the external microSD card.
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As a third step, boot the current TWRP.
3.1 WIPE > FORMAT DATA¹ > YES type (not Advanced Wipe)
3.2 TWRP Menu → Wipe → Advanced wipe → Dalvik / System / Data / Cache
3.3 Back to TWRP Menu → Install → e-0.7-n-2019112732147-dev-peregrine.zip
3.4 Wipe > Cache/Dalvik → Restart system
/e/ OS should start and initialize itself.
¹Note: “Format Data - Yes” will wipe all of your Apps, Backups, Pictures, Videos, Media and removes Encryption on Internal Storage.