Some publishers like Sindhi Prakashan (Mumbai) or Roshan Mirza Sindhi Publications (Hyderabad, Pakistan) have digitized their backlog. They may offer an exclusive PDF for a nominal charity donation (usually around $3 to $5).
I understand you're looking for a of an exclusive Sindhi-language PDF of the Ramayan, rather than a direct download link. ramayan in sindhi pdf exclusive
If you come across a file claiming to be exclusive, verify it against these features: Some publishers like Sindhi Prakashan (Mumbai) or Roshan
Insights from renowned Sindhi scholars that explain the verses in the context of Sindhi culture and history. How the Digital Format Empowers the Community ramayan in sindhi pdf exclusive