There are only two software updates related to the IMA. One was unofficial, the second one we owners in the US got letters about.
There are two other software updates, for a total of four. The other two are for the CVT & how the auto stop works. We have never had a Honda dealer mechanic explain how the process works exactly. One theory is that once they connect to the computer all the available update get downloaded. The other theory is that the mechanic' screen will show available updates and it is up to them to click OK. So do beg the service writer to write a note to the tech to please apply all available update.
As an aside, some really early build Insights could not take all the updates. That may have been true or bullshit dealers told customers. As I have pointed out here a few times, Honda got in deep **** applying updates to Civic hybrids without telling the customer it was happening. This has made dealers shy to offer or do them. It is the collective experience around here that all the updates are good and none of them reduce fuel economy. (The main complaint of Civic Hybrid owners)