How to upgrade AD connect using In-place upgrade

Usually, its recommended to all upgrades in non-production hours but doing an Azure AD connect is considered relatively safe as even with sync service disrupted there is not much to lose as all the users are already synced. Please follow the steps mentioned below to upgrade AD connect:

Note: Ensure the Current Cycle completed as it is required full sync once AAD Connect completed
Note: Please make you tun this setup from the computer that has AD connect already installed

1. Please download the latest version of AD connect from this link: https://www.microsoft.com/en-us/download/details.aspx?id=47594

2. Please run the setup of the latest version of AD connect

3. Select the Agreement and click on Continue
4. Click on Upgrade
5. Enter the Credentials for the Azure AD and click on Next
6. Select start full sync if you want to begin the sync once the installation completed. I have disabled immediate sync once upgrade.

7. Click on Exit once the upgrade completed.
8. Please run the below-mentioned command once the upgrade is complete:

Start-ADSyncSyncCycle -PolicyType initial

This type of upgrade is called In-place upgrade and this method is preferred when you have a single server and less than about 100,000 objects. You can learn more about In-Place upgrade below:

https://docs.microsoft.com/en-us/azure/active-directory/hybrid/how-to-upgrade-previous-version#in-place-upgrade