Jean-Louis, F5MAW (also ZS6AAG, previously 5N9JLH, TT8JLB, 3DA0MW) got in touch. Hopefully someone can help him:

I was C91MSF a few years ago. Actually,  I am currently in Mozambique until the end of October this year. I would really like to reapply for the C91 license but I don’t now find the way where to apply again. Can someone please send me any information on how to apply for the license in this country? Many thanks in advance. My email: f5maw[at]hotmail.com