I suggest you first cross reference the “manual” install page Install /e/OS on a Google Pixel 4a - “sunfish”.
Part of me says just change to those instructions … but
Did 1 - 4 make sense to you? Did you complete the unlock (it kinda looks like no ??)?
Then the top part of your image suggests that the script is intending to move on with flashing the “preparatory secondary partitions”.
Did you see the Bootloader screen when expected?
Does it show the lock status? Locked or unlocked?
I suggest to review to Unlock instructions and “Requirements” on the install page. Using this may be easier as you are in charge.
This page needs an edit Eos Web Installer Support improvements but may contain clues if you keep going with eosinstaller 