You have Acronis Cyber Infrastructure 3.0.4 and want to update it to version 3.0.5.
In the web console, you click Check for updates, but don't get any result.
Issue in the product.
Acronis development team is working in the issue.
Meanwhile, please use this workaround.
Restart Vstorage UI backend with following command:
# systemctl restart vstorage-ui-backend
Now the update should be available in the web console.