Just modify the .uplugin file from AdvancedSession and AdvancedSteamSession to add the module dependencies. is a warning as inter-module dependencies where added in 4.17.
I modified it to silence those warnings:
{ "FileVersion" : 3,
"FriendlyName" : "Advanced Sessions",
"Version" : 1.9,
"VersionName": "1.9",
"Description" : "Adds new blueprint functions to handle more advanced session operations.",
"Category" : "Advanced Sessions Plugin",
"CreatedBy" : "Joshua Statzer",
"CreatedByURL" : "N/A",
"Modules":
{
"Name": "AdvancedSessions",
"Type": "RunTime",
"LoadingPhase": "PreDefault"
}
],
"Plugins":
{
"Name": "OnlineSubsystem",
"Enabled": true
},
{
"Name": "OnlineSubsystemUtils",
"Enabled": true
}
]
}