Before you install Batch API you will need the following.
License key
Use a supported operating system.
Microsoft support has additional information on downloading Service Packs.
Available memory: 1GB (minimum), 4GB (recommended).
Disk Space: At least 100MB of drive space is required to install the Batch API program files.
Further space is required to install the dataset files. Refer to the Dataset guide supplied with your data for details about how much space you will need for each dataset. You also need to ensure that there is sufficient disk space for Batch API to process your addresses. The space used depends on the size and type of your input database, but as a general rule you should ensure that space equivalent to at least the size of your database is available.