Translator: Shah Mohammad Muti Ahmad Aftabi, Shah Fakir
This is considered the best Bengali translation of the Maktubat sharif, although there are a few more translations as well.
This is published in 5 volumes, from the original 3 volumes in Persian.
মকতুবাদ শরীফ ১ম খন্ড
মকতুবাদ শরীফ ৩য় খন্ড
Files hosted at Internet Archive
archive.org/details/MaktubatMujaddidAlf-e-sani-BengaliTranslation
Download volume 1 (14.6 MB)
Download volume 3 (15.9 MB)