Here’s the simplest way to get Kalpa Sutra in English:

• The most commonly used free English version is the public‑domain translation by Hermann Jacobi (Śvetāmbara text). You can legally download it from major digital libraries.
• If you prefer, I can share the full English text here in parts.

For a clear overview and meaning explained in simple language, see these JainKnowledge pages:

• Explain the meaning of Kalpasutra in detail
• Main teachings of Kalpasutra