Very large files have to be split into multiple units in order to be downloadable. 'Tar' is a data compression format that packs files into parcels of varying size and also unpacks them again later.
Multi-Tar file names end with sequential numbers. For example, the following archive files feature seven individual data parcels:
The Avosound order confirmation will inform you if the product is a Multi-Tar download.
Download Keka for MacOS here. Keka is a freeware tool and you can find more information at the Keka-Page.
Unpacking .tar files will not work until all packs have been downloaded. Please download all .tar files from your download first, otherwise the untar will fail.