Do not settle for a raw ISO. You need the cumulative patches:
A "full ISO hot" setup is technically version 1.04, though the community colloquially calls any post-1.02 install "hot." lock on modern air combat full iso hot
Once installed, the term "hot" also refers to in-game tactics. Here is how to dominate the Crimean skies in this configuration: Do not settle for a raw ISO
A Full ISO implementation (referencing ISO 15007: Road vehicles — measurement of driver visual behavior, adapted for aviation) ensures: A "full ISO hot" setup is technically version 1