According to Farias Kranti, cited by Velinkar 178, the "Falnir" Coelho family in Mangalore has a well-preserved MS of the Khristapurana. Jason Pinto inquired with the family, they told him they had given the MS to Friar Sidney Mascarenhas (his mother was a Coelho). Unfortunately, what Sidney has is a copy of J.L. Saldanha's 1907 edition, The Christian Puranna. Disappointment!
See Joseph Velinkar, Fr Thomas Stephens: The First Englishman in India (Margao - Goa: CinnamonTeal, 2021).