Interestingly enough there exists a v2 version to download for all the links, will test these to see if provides any differences.
https://download.kobobooks.com/ereader/iink/v2/myscript-iink-recognition-math.zip
https://download.kobobooks.com/ereader/iink/v2/myscript-iink-recognition-diagram.zip
https://download.kobobooks.com/ereader/iink/v2/myscript-iink-recognition-raw-content.zip
https://download.kobobooks.com/ereader/iink/v2/myscript-iink-recognition-text-en_US.zip
They are also different filesizes to the v1