For those who may be interested, here is the download link for an edition of Bhaṭṭoji's Siddhānta-Kaumudī, which also contains the complete text of his Advaitic work Tattva-Kaustubha:

https://archive.org/details/Siddhanta-Kaumudi-With-Tattva-Kaustubha-Bhattoji-Dikshitas-Commentary-On-The-Brahmasutra/page/n229

With best regards,

Madhav M. Deshpande

Professor Emeritus

Sanskrit and Linguistics

University of Michigan

[Residence: Campbell, California]