I get the following error message when updating to the latest release:

Unknown column 'access' in 'field list'

Any idea how to resolve this?

I am updating from 2.4.5+build.2020.05.07.21.35.06.e8f8a6125 and Joomla 3.9.19

Also tried variants: a local server with php 7.3 and 7.4, previous upgrade to Joomla 3.9.20, and multiple overwrites of CB. No difference.

Just realized that when I run the DB check, I get various schema corrections.
However, when I try to run the repair, I get an success message, although nothing has been changed.

Core CB database structure differences:
Table #__comprofiler Column id type is int instead of int(11)
Table #__comprofiler Column user_id type is int instead of int(11)
Table #__comprofiler Column hits type is int instead of int(11)
Table #__comprofiler Column message_number_sent type is int instead of int(11)
Table #__comprofiler Column avatarapproved type is tinyint instead of tinyint(4)
Table #__comprofiler Column canvasapproved type is tinyint instead of tinyint(4)
Table #__comprofiler Column canvasposition type is tinyint instead of tinyint(4)
Table #__comprofiler Column approved type is tinyint instead of tinyint(4)
Table #__comprofiler Column confirmed type is tinyint instead of tinyint(4)
Table #__comprofiler Column banned type is tinyint instead of tinyint(4)
Table #__comprofiler Column bannedby type is int instead of int(11)
Table #__comprofiler Column unbannedby type is int instead of int(11)
Table #__comprofiler Column acceptedterms type is tinyint unsigned instead of tinyint(1) unsigned
Table #__comprofiler_field_values Column fieldvalueid type is int instead of int(11)
Table #__comprofiler_field_values Column fieldid type is int instead of int(11)
Table #__comprofiler_field_values Column ordering type is int instead of int(11)
Table #__comprofiler_field_values Column sys type is tinyint instead of tinyint(4)
Table #__comprofiler_fields Column fieldid type is int instead of int(11)
Table #__comprofiler_fields Column maxlength type is int instead of int(11)
Table #__comprofiler_fields Column size type is int instead of int(11)
Table #__comprofiler_fields Column required type is tinyint instead of tinyint(4)
Table #__comprofiler_fields Column tabid type is int instead of int(11)
Table #__comprofiler_fields Column ordering type is int instead of int(11)
Table #__comprofiler_fields Column cols type is int instead of int(11)
Table #__comprofiler_fields Column rows type is int instead of int(11)
Table #__comprofiler_fields Column sys type is tinyint instead of tinyint(4)
Table #__comprofiler_fields Column pluginid type is int instead of int(11)
Table #__comprofiler_lists Column listid type is int instead of int(11)
Table #__comprofiler_lists Column viewaccesslevel type is int unsigned instead of int(10) unsigned
Table #__comprofiler_lists Column ordering type is int instead of int(11)
Table #__comprofiler_members Column referenceid type is int instead of int(11)
Table #__comprofiler_members Column memberid type is int instead of int(11)
Table #__comprofiler_plugin Column id type is int instead of int(11)
Table #__comprofiler_plugin Column viewaccesslevel type is int unsigned instead of int(10) unsigned
Table #__comprofiler_plugin Column ordering type is int instead of int(11)
Table #__comprofiler_plugin Column published type is tinyint instead of tinyint(3)
Table #__comprofiler_plugin Column iscore type is tinyint instead of tinyint(3)
Table #__comprofiler_plugin Column client_id type is tinyint instead of tinyint(3)
Table #__comprofiler_plugin Column checked_out type is int unsigned instead of int(11) unsigned
Table #__comprofiler_tabs Column tabid type is int instead of int(11)
Table #__comprofiler_tabs Column ordering type is int instead of int(11)
Table #__comprofiler_tabs Column ordering_edit type is int instead of int(11)
Table #__comprofiler_tabs Column ordering_register type is int instead of int(11)
Table #__comprofiler_tabs Column pluginid type is int instead of int(11)
Table #__comprofiler_tabs Column sys type is tinyint instead of tinyint(4)
Table #__comprofiler_tabs Column viewaccesslevel type is int unsigned instead of int(10) unsigned
Table #__comprofiler_userreports Column reportid type is int instead of int(11)
Table #__comprofiler_userreports Column reporteduser type is int instead of int(11)
Table #__comprofiler_userreports Column reportedbyuser type is int instead of int(11)
Table #__comprofiler_userreports Column reportedstatus type is tinyint instead of tinyint(4)
Table #__comprofiler_views Column viewer_id type is int instead of int(11)
Table #__comprofiler_views Column profile_id type is int instead of int(11)
Table #__comprofiler_views Column viewscount type is int instead of int(11)
Table #__comprofiler_views Column vote type is tinyint instead of tinyint(3)
Table #__comprofiler_sessions Column userid type is int unsigned instead of int(11) unsigned
Table #__comprofiler_sessions Column ui type is tinyint instead of tinyint(4)
Table #__comprofiler_sessions Column expiry_time type is int unsigned instead of int(14) unsigned
Table #__comprofiler_ratings Column id type is int instead of int(11)
Table #__comprofiler_ratings Column user_id type is int instead of int(11)
Table #__comprofiler_ratings Column item type is int instead of int(11)
Table #__comprofiler_ratings Column target type is int instead of int(11)