Install a New Language in Windows 10
If you bought a new computer or laptop from another country and you realize you don’t know default language in Windows 10 operating system or just want to change from English to your language, you can do it easily.
Now, Windows 10 supports changing the default language at any time, even if you bought english version of microsoft license.
First of all, make sure you are logging in with a administrator account, then:
1. Go to Start – Setting (or just press Windows button + i) – Time & language.
2. From left menu, select Region & language, then click “Add a language”
3. Search for your language and click install. If you want this language to be your default language, make sure to check “Set as my Windows display language” and click install.