You don't really need to disable scaling every single time.. just
1. Disable scaling in the "AoK HD.exe" (steamapps/common/Age2HD..) --> go "Properties" + "compatibility" to disable scaling
2. install the "module-mod" aka:(http://steamcommunity.com/sharedfiles/filedetails/?id=141103430&searchtext=resolution)--> follow the instructions below (1920x1200 worked well for me)
3. Start the game, go to settings and change from "full desktop" to windowed mode + Press Alt+enter = Now the game should be playable :)
2b: INSTRUCTIONS: (copy from "Change screen resolutions"/workshop-page)
1. Download using the link above and extract everything into the AOE2 root folder.
2. Close the game and go to the \modules\ directory (NOT ''mods''! it's MODULES, my own folder in the zip!) under your Age2HD directory in steamapps.
3. Open the SetResolution.ini file and change the values to whatever resolution your monitor supports.
Worked on my SP4
