The BMW ICOM ISTA standalone version is a version that disables some hardware checks and server checks that are unnecessary for individual users.
As you know, ISTA-D can receive the data related to the vehicle maintenance from the BMW server. If you are a general individual user, you can not access the BMW network anyway.
The installation process is similar to the basic ISTA-D installation process, and the required files are almost all contained within the archive. There is only an RCleaner that initializes the registry, which is included in the ISTA-D download link, so download it if you need it.