If you look in your World of Tanks folder on your hard drive, you will see an Aslains_Custom_mods folder. Inside this folder is a README.txt file. You can open this in Notepad or Notepad++ (recommended). It explains about the macro.
Now in case you do not know how to use the Aslains_Custom_mods folder here goes:
In the Aslains_Custom_mods folder, create a folder and name it res_mods. The folder structure inside this folder must be exactly like the structure inside your res_mods folder in your World of Tanks folder where your mods/xvm resides. Inside this res_mods folder create a folder and name it either the name of the current version, which in the current case is 0.9.16 or you can name it version. Naming it version instead of the actual version number (0.9.16 etc) is what is meant by the macro and simply means that it does not matter what the current version of the game is at the moment, it will use it.
Now inside this version folder you can put any custom changes that you normally make to your settings or mods. For example, I use the Battle Assistant mod and the default key to activate it is the G key. I like to use the F key instead of G. So I edited the mod_battle:assistant.txt file that resides in World_of_Tanks>0.9.16>scripts>client>gui>mods and changed the key to activate from G to F. I have created the following folder structure inside the Aslains_Custom_mods folder: res_mods>version>scripts>client>gui>mods. I placed my edited mod_battle:assistant.txt file inside this mods folder. In order for the installer to use this folder structure, you have to save a zip file of the res_mods folder that is in the Aslains_Custom_mods folder.
Here is a screenshot of what is inside my Aslains_Custom_mods folder. The res_mods.7z is the zipped version of the same res_mods folder you can see there. You can also save it as a .zip file in case you do not have 7zip. 7zip files are little smaller and more efficient. But you have to save it as either a zip file or a 7z file in order for the installer to use it.
I hope this has answered your question. If not, that is ok, I had fun writing it anyway.