Modern Day Scenario installation instructions:
Step One: Make a copy of your Victoria 2 install. Take the entire folder and copy it elsewhere.
This mod requires Victoria 2 v1.3,
not v1.4b.
If you're using a Windows computer, it's recommended that that you copy it outside of C:/Program Files, though this isn't absolutely necessary, it will make your life easier.
You can subsequently rename the folder "Victoria 2 Modern Day Scenario" if you want.
Step Two: Download the mod. Link at the top of the post.
Step Three: You will get a .zip file.
To unzip it, you need a program capable of doing so. I use Zipeg, though there are many out there. When you unzip it, you should get a folder called "Modern Day Scenario 0.10".
Step Four: Use your selected program to unzip the file. If you use a Windows, you can unzip the file "over" the installation. For Mac users:
where the top folder is your installation copy and the bottom the unzipped, downloaded file.
Copy each folder from the downloaded file, except for "gfx" - place the one folder it contains, "flags", in your installation's gfx folder.
This method will also work for Windows users.
Step Five: Don't launch the game yet! You need to clear your map cache and flag cache.
Your map cache is found in (according to where the game is installed and which OS you run):
[Windows, not in Program Files] : Your installation/map/cache
[Windows in Program Files] C:/Your name here/AppData/Local/VirtualStore, then find the Paradox folders there.
[Mac] Your name here/Library/Application Support/Victoria 2/DataChanges/map/cache
It looks like this:
Delete these files, but not the folder itself.
Your flag cache is found in:
[Windows, not in Program Files] Your installation/gfx/flags (among all the flag pictures)
[Windows, Program Files] C:/Your name here/AppData/Local/VirtualStore, again, find the Paradox folders from there.
[Mac] Your name here/Library/Application Support/Victoria 2/DataChanges/gfx
and looks like this:
Again, delete these files, but not the folder they are stored in.
The game will recreate them when you run it.
Step Six: Run the game. Have fun.
You'll need to empty the map- and flag-cache every time you switch between the mod and vanilla Victoria 2 (unless you've installed it outside C:/Program Files on a Windows.).