Please note: Due to copyright laws, I cannot host files directly. However, the following sources are public domain or open-access archives trusted by academia.
Most of these PDFs are in the public domain or shared under open-access licenses for non-commercial educational use. However:
Along with the main Saṃhitā, you may want:
If you download a complete Krishna Yajur Veda PDF Sanskrit, here is the standardized table of contents you should expect (based on the Taittiriya Shakha):
A massive repository. Navigate to "Vedas" -> "Krishna Yajur Veda" -> "Taittiriya Shakha." They offer downloadable PDFs of handwritten manuscripts and print editions.
This institute has a large digital library of rare Sanskrit texts. Their "Muktabodha Digital Library" offers the Krishna Yajur Veda (Taittirīya recension) in PDF format, often with searchable features.