Where to find firmware updates for CheckMK Server (Enterprise)?

This:
OMD[SMS]:~$ cmk-update-config -v --debug
Initializing application…
Updating Checkmk configuration…
ATTENTION: Some steps may take a long time depending on your installation, e.g. during major upgrades.
1/32 Rewriting password store…
2/32 Migrate Visuals context…
3/32 Update global settings…
4/32 Rewriting tags…
5/32 Rewriting hosts and folders…
6/32 Rewriting rulesets…
Extracting excluded SNMP sections
Replacing ruleset non_inline_snmp_hosts with snmp_backend_hosts
7/32 Rewriting discovered host labels…
8/32 Rewriting autochecks…
9/32 Cleanup version specific caches…
10/32 Migrating fs_used name…
11/32 Migrate pagetype topics…
12/32 Migrate dashlets…
13/32 Migrate LDAP connections…
14/32 Rewrite BI Configuration…
Skipping conversion of bi.mk (already done)
15/32 Set version specific user attributes…
16/32 Check for insecure password hashes, enforce password reset…
17/32 Rewriting inventory data…
Skipping py2 inventory data update (already done)
18/32 Migrate audit log…
New audit log already existing. Skipping.
19/32 Sanitize audit log (Werk #13330)…
Skipping (already done)
20/32 Rename discovered host label files…
21/32 Rewriting host, service or contact groups…
22/32 Rewriting notification configuration for ServiceNow…
23/32 Renewing certificates without server name extension…
Skipping (nothing to do)
24/32 Adding site CA to trusted CAs…
25/32 Rewrite mknotifyd config for central site…
26/32 Rewriting InfluxDB connections…
27/32 Disabling unsafe EC rules…
28/32 Update bakery links and settings…
29/32 Remove old custom logos (CME)…
30/32 Fix registered hosts symlinks…
31/32 Update license usage history…
32/32 Synchronize automationuser secrets…
Done
OMD[SMS]:~$