This is what I have received from the University.
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Thank you for your message. You have reached the McGill School of Continuing Studies.
At the School of Continuing Studies, our 30-credit programs (Undergraduate certificates and Diploma programs) are part-time programs, but can be pursued full time and therefore are open to international students. Classes are usually offered once a week for 13 weeks per semester and are generally from 6 p.m. to 9 p.m. Courses can be taken in the Fall, Winter, Spring and Summer sessions. For international students, once admitted to the program, they receive a study plan that details the exact length of their studies, (usually 1 year) which allows them to maintain a full-time status.
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It is a part time program but it can be done full time and open for International students.