Error log:
KSP.log

After I installed Impossible Innovations, the game does not start up and crashes.

Dude!! This thing is for KSP 1.1 !!!

The IFS, CRP, "Extraplanetary Launchpads" and even TweakScale are horribly outdated - and this explains the marvellous bork on IFS (one of the most resilient add'ons I know).

Delete everything that is not Year2200, delete the while Year2200/Plugins too (and not only KSPAPIExtensions), install the updated dependencies I mentioned and I think this thing can have better chances of running.

We have some weird interaction on Year2200's DLL (KSPAPIExtensions).

[LOG 15:55:04.425] [UIPartActionsExtendedRegistration] Elected unopposed version= 1.7.5.0 at C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\Year2200\Plugins\KSPAPIExtensions.dll
[EXC 15:55:04.429] MissingMethodException: void PopupDialog.SpawnPopupDialog(string,string,string,bool,UnityEngine.GUISkin)
        UnityEngine.DebugLogHandler:LogException(Exception, Object)
        ModuleManager.UnityLogHandle.InterceptLogHandler:LogException(Exception, Object)
        UnityEngine.Debug:CallOverridenDebugHandler(Exception, Object)

This triggers a bug on the runtime due a glitch on Reflection. I used to thing it was a Mono/C# problem, but I'm convinced it's something on KSP itself, as the switch to Unity 2019 (using MS C#'s runtime) didn't fixed the problem.

In a way or another, what really crashed your game we IFS (perhaps due a Toe Stomping Fest triggered by that glitch above, but I would need to reproduce your setup to check it properly).

[ERR 15:59:06.623] [IFS]: nextTankSetupEvent Error: The requested operation caused a stack overflow.

[EXC 15:59:07.955] StackOverflowException: The requested operation caused a stack overflow.
        InterstellarFuelSwitch.InterstellarFuelSwitch.nextTankSetupEvent () (at <ea4dd4781d454ca69f1a9cb5ca798a0f>:0)
<infinite repetitings of the last log entry until the tragic end).

I would suggest to delete C:\Program Files (x86)\Steam\steamapps\common\Kerbal Space Program\GameData\Year2200\Plugins\KSPAPIExtensions.dll to see what happens.