The installation cannot be continued due to the error message:
"Specified database is not valid. Please choose Veeam ONE database or create a new database to proceed."
The error message occurs when you install Veeam ONE using previously created and in some cases migrated database the version of which is higher than the installer.
Follow the steps below:
1. Install Veeam ONE using a temporary database which will be created automatically once you start the installation. Make sure the database name is different from the default database name "VeeamOne" to avoid any conflicts with the original database in case it is located on the same SQL Server.
2. Change Veeam ONE database connection settings to connect previously created Veeam ONE database using Veeam ONE Settings Utility;
3. Remove temporary created database using SQL Server Management Studio.
Please be aware that starting from September 2018 downloading updates will require an active contract for the corresponding product.