Analysis Services 2005 - Setup and Upgrade on a Cluster
If you plan to install Analysis Services as part of your installation of SQL Server Database Services, you simply need to select the checkbox against Analysis Services at the Feature Selection stage during setup. The following link will provide you with more details about each step during setup.
https://msdn2.microsoft.com/en-us/library/ms179530.aspx
However, if you want to install ONLY Analysis Services on the cluster without installing any other components, then you need to follow the steps highlighted in the KB article 910230.
https://support.microsoft.com/?id=910230
Adding Analysis Services to existing SQL 2005 installation
If you have a SQL Server 2005 cluster and want to add Analysis Services under the same virtual server that SQL Database Services is using, then you need to install Analysis Services using a command prompt.
NOTE - Do not use Add/Remove Programs to add Analysis Services to your existing SQL Server 2005 installation on the cluster. Although the Add/Remove programs interface will allow you to select AS, but it will fail at the setup stage. This is because Add/Remove programs only allows you to add or remove Nodes in a cluster.
To install Analysis Services using command prompt, refer to the following article which provides details about the different switches.
https://msdn2.microsoft.com/en-us/library/ms144259(SQL.90).aspx
Upgrading Analysis Services 2000 to 2005
Analysis Services 2000 clusters can easily be migrated to Analysis Services 2005 using the steps highlighted in this KB