1.6 Game 'disappeared' without giving any error message, supposedly 2 teammates dropped at same time as me. Voobly kept running normal. Please see attached file. All the minidump files are last updated months ago so no use in providing those.

Looking at logs files myself but doesn't seem they were updated after the incident either.
It was this game btw: https://www.voobly.com/match/view/26165301

or maybe this one

We need the event viewer reports of the crashes. See the patch's page.

Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x001d2583
Faulting process id: 0x50dc
Faulting application start time: 0x01da0c1fcc0641e6
Faulting application path: C:\Users\windowsusername\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\windowsusername\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: 4cadc583-e41a-40a0-89e9-27dc82caa50e
Faulting package full name:
Faulting package-relative application ID:

Happened again:
Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x000db88d
Faulting process id: 0x58f8
Faulting application start time: 0x01da10cf51addab4
Faulting application path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: 7205cdc1-f569-4741-8740-58261fd86e42
Faulting package full name:
Faulting package-relative application ID:

happened again:
Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x000db754
Faulting process id: 0x1c88
Faulting application start time: 0x01da170798d1a6b9
Faulting application path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: 3d510702-7bf8-49bf-a5c5-ee0c471dfd26
Faulting package full name:
Faulting package-relative application ID:

i was sicilians and clicked on tech tree in imperial when it happened.

This happened again. I was persians and clicked tech tree in imperial. I think there might be pattern here.

Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x000db88d
Faulting process id: 0x1fb8
Faulting application start time: 0x01da17bb7fc2d766
Faulting application path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: aff7b5d9-8ad2-432e-a1c5-6e7e5c78d7b6
Faulting package full name:
Faulting package-relative application ID:

This happened again.

I was gurjaras and clicked tech tree in imperial. I'm 100% sure i watched tech tree too earlier in the game (when going up castle) and it was fine at that moment.

Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x000db754
Faulting process id: 0x2378
Faulting application start time: 0x01da188bb49aab49
Faulting application path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: b2a08206-bf6d-4125-8b1a-7170256b3d0c
Faulting package full name:
Faulting package-relative application ID:

We accidently released a new version of the patch with a DLL missing. Sorry about that.
A new version will be released tomorrow.

is that the problem here?

At least one of the problems. A new version will be released this morning that will address several reported problems -- including the latest balance changes.

Faulting application name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Faulting module name: age2_x1.Exe, version: 0.7.26.809, time stamp: 0x3b7433ec
Exception code: 0xc0000005
Fault offset: 0x000db754
Faulting process id: 0x3cbc
Faulting application start time: 0x01da1e246312971f
Faulting application path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Faulting module path: C:\Users\J\AppData\Roaming\Microsoft Games\Age of Empires ii\AGE2_X1\age2_x1.Exe
Report Id: 14a69cf7-9067-421e-8eec-7b463a56d704
Faulting package full name:
Faulting package-relative application ID:

Playing as Lithuanian clicking techtree in feudal/castle (and in previous age also looked at tech tree without problem)

can someone look into this please? seems to be a clear trigger so maybe not difficult to fix?

A fix for this is pending, Mikael has spotted the problem.