This is a grey area. Sulaiman Moulid passed away several decades ago; however, his works are often held by family trusts or specific Islamic foundations (such as the Baraza la Kiswahili la Zanzibar ).
The Story of Prophet Sulaiman (عَلَيْهِ ٱلسَّلَامُ) - My Islam sulaiman moulid pdf
Do you require a version with for easier pronunciation? g., large font)? This is a grey area