Answer
In Montevideo, free or subsidized Spanish courses for migrants are sometimes available through government, municipal, university, and community programs. However, enrolment periods, levels, and the number of places vary, so you cannot count on ongoing enrolment at any time of year.
When searching, check who is eligible to participate, whether residencia or a cédula is needed, when the placement test is held, and whether a certificate is issued. An in-person course may be available only in a particular area and at particular times, so compare it with the online format and the cost of travel.
Check current announcements from the Intendencia de Montevideo, relevant university programs, and migrant support organizations. While waiting for enrolment, use language exchanges and conversational practice: a free course is useful, but does not by itself ensure daily use of Spanish.