Please confirm you are running version 9.5.4.2399 prior to installing this update. You can check this under Help | About in Veeam Backup & Replication console. After upgrading, your build will be version 9.5.4.2615.
If you are trying to update Veeam Backup & Replication and running a version older than 9.5.4.2399, download the most recent Update ISO directly Veeam website.
Prior to installing this update please reboot the Veeam server to clear any locks on the Veeam services and when the reboot is done, please stop all the Veeam services and apply the update. After installing the update, please start the Veeam services, open the console and allow Veeam B&R to update its components.
NOTE: This patch must be installed on all remote backup consoles manually.
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MD5: 63e3b0b0bdc1b10f89707045eb9aa826
SHA1: 23cf299ceae2ab74ee6554a7b79a2339b2907de1
NOTE: "Add or Remove Programs" will still show version 9.5.4.2399 after Veeam Backup & Replication 9.5 U4 Day 0 Update is installed. This is expected behavior. The actual version can be looked up in Help | About dialog of Veeam Backup & Replication console.