Login to your school's admin server as a domain administrator.
Open the SOLUS3 Deployment Server UI.
Navigate to the Upgrades tab > Updates tab.
Select the patch to be deployed > Deploy > set the date to tomorrow at 01:00 > select Schedule > select Yes > select No.
Note:
If the patch is not listed, please check the proxy settings under Settings > My Site > Proxy settings. Restart the Solus3 Deployment Service.
You can check to see if a patch has been deployed by navigating to Upgrades tab > Deployment History.
Just to reassure you, if there are superseded patches, then Solus will prevent you from installing these.
Dec 2020 - 26204 - Only for Schools using SIMS Online Services (e.g. Parent Lite)
Dec 2020 - 25918 - All schools - Undo patch for COVID attendance codes.
Oct 2020 - 26088 - All schools - SIMS Census Patch