Upvote:3
The Logicmuseum site lists
Summa Logica: Bruges, Bibl. de la Ville 498 (an. 1340); Avignon, Bibl. Mun. 1086 (1343)
meaning there is (or was) a manuscript in the Bruges municipal library (MS 498) from the year 1340, and one in the Avignon municipal library (MS 1086) from 1343.