hi thanks for writing. for some reason google dosn't list them when you search "europe countries. ive added them now so you shoud be able to download it in a bit once the page update. if you see that anyting else is missing pls just write a comment, and ill fix it.
I had a look at the google results (usually I use duckduckgo as search engine) and indeed it’s a weird list! Some territories or provinces are in the list and some countries are missing. More authoritative sites give lists between 44 and 52 countries, so your pack of 54 seems complete :)
