Insurgency and Squad Editor won’t show up alongside the other content you acquired from Marketplace because they’re a different type of content. You can see the Marketplace library at the top circled in red in the screenshot once you’re in the Unreal Engine section, and that sounds like what you’re looking at currently.
In the launcher, you should look for the Library I’ve circled in Blue. That will show all content you acquired through EGS, which would include Squads and Insurgency.
I hope this helps, but that’s about the extent of the troubleshooting I can offer. If you need to do further troubleshooting, I recommend that you contact the team that provides support for the Epic Games Store. You can reach them here.
Good luck!
Josh