We recommend having administrator access for the service account user performing the installation or upgrade. On the first step of the install/upgrade process, you are presented with a list of components and prerequisites that need to be installed. Check the boxes for ALM and Agile Central (along with whichever ones you need). This way you will be able to continue with the installation/upgrade process. By default, all of the components are checked to be installed if this is the first time. However, some users only need certain components, so if you are upgrading from a previous installation where other components were not installed, you may not have the ALM or Agile Central components checked.