Sorry guys... my fault , i'll try to explain better how to install these fonts.
1- Download Zip file
2- Open Zip file. Now you'll see 4 files from Pfalz; Albatros; Austria-Hungary and Fokker all having a .tts (true type format) extension. Ex: Albatros Serial Numbers.tts
3- Double click in one of those files, for it to open.
4- With the file opened, check your upper left corner, there will be two options: to print and to install, choose to install.
5- Do the same to the other fonts
6- Now open word or wordpad (from Windows). In the type of writing (where you choose Arial, Arial black or any other type) you will now have: Albatros, Austria, Fokker and Pfalz types
7- From those, choose the letter type you want... and have a happy writing! It will only work for numbers (serials) or with any letters or dot/dash that are in the font file.
If any more doubts please let me know.
Cheers.