(EDIT for JHF 26 version; the original was the JHF 54 version)
Found it. Here's the package:
[Expert@cpmgmt01:0]# da_cli packages_info |jq -r '.packages[]|select(.packageKey|contains("BUNDLE_R81_20_JUMBO_HF_MAIN_SC"))'
{
"availableFrom": "2024-04-07 00:00:00",
"blocksUninstall": false,
"broughtVersion": "6.0_5_4",
"build": 54,
"category": "capability",
"description": "<p>SmartConsole R81.20 version is compatible with any R81.20 Security Management server. </p><p><strong>SmartConsole automatically updates to the latest Build, as long as you have an Internet connection. The update is rolled out gradually and should be completed within 1 week. It is not necessary to download and install newer builds manually</strong></p>",
"displayName": "R81.20 SmartConsole Build 653",
"fileSize": "436179034",
"filename": "Check_Point_SmartConsole_R81_20_jumbo_HF_B653_Win.tgz",
"hasMetadata": true,
"htmlReportExists": false,
"installCritical": false,
"isBlinkImage": false,
"isHfa": true,
"isInRepository": false,
"md5": "76e12ddf2ac8ea2657057b61647bc76a",
"order": 0,
"packageKey": "CheckPoint#CPUpdates#All#6.0#5#4#BUNDLE_R81_20_JUMBO_HF_MAIN_SC#54",
"packageOrigin": "Download Center",
"packageType": "Wrapper",
"product": "CPUpdates",
"requiresReboot": false,
"state": "Available for download",
"version": "6.0"
}
But you need the JHF 26 version which was Build 646. You need the package named Check_Point_SmartConsole_R81_20_jumbo_HF_B646_Win.tgz and you should be ok:
From Expert mode:
da_cli add_private_package package=Check_Point_SmartConsole_R81_20_jumbo_HF_B646_Win.tgz
da_cli download package=Check_Point_SmartConsole_R81_20_jumbo_HF_B646_Win.tgz
da_cli verify package=package=Check_Point_SmartConsole_R81_20_jumbo_HF_B646_Win.tgz
da_cli install package=Check_Point_SmartConsole_R81_20_jumbo_HF_B646_Win.tgz reboot_delay=60