mac OS Safari 12.0.1 update installer problem
Ever since I installed the mac OS Safari 12.0.1 update, my iMac fails to boot up. When I restart holding down the option key, it shows a "mac OS installer" as the startup disk, and I have to select my internal HD for it to boot normally. This has happened 3 times. The first 2 times I ended up restoring my entire HD, once from a backup to OS 10.13.6 that uses Safari 11, and the second time using recovery to reinstall 10.13.6.
However, my password manager 1Password 7 will not work with Safari 11, and I continually receive the message that I need to update to Safari 12 in order for 1Password 7 to work. How do I remove the mac OS installer? It does not show up in a spotlight search.
iMac, macOS High Sierra (10.13.6), mid 2011 27" iMac, SSD, 24G ram