kiwiviator wrote on May 5^th, 2019 at 5:02am:

if the updates for the P3DV4 model are cumulative or not?

Yes they are but withing a major version, which is indicated by the first 2 digits.
E.g. 1300. So everythig that starts with the 13 is cumulative for the 1300, means you need to instal just the latest one.