Trying to update MacOS Catalina (10.15.3-> 10.15.6). When when I click the preboot “drive” to continue the update, the process gets stuck here. Any ideas?

Trying to update MacOS Catalina (10.15.3-> 10.15.6). When when I click the preboot “drive” to continue the update, the process gets stuck here. Any ideas? submitted by /u/Bderken
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