Windows 8.1 Pro change language

You must download the ISO with the MUI packs from MSDN

mu_windows_8_1_language_pack_x86_dvd_2706085.iso
mu_windows_8_1_language_pack_x64_dvd_2706084.iso

, mount the ISO and copy the MUI you want to install to the HDD. Now rename the CAB to lp.mlc and make a double click on the file to run setup.

1. You can go to Control Panel.

2. Then click on View by : Category on the right upper corner.

3. Then, Under the category Clock, Language and Region, click on add a language link.

4. If you see the language you want in the list, go on step 9.

5. If you don't see the language you want in the list, click on add a language button

6. Then, click on the language you want, then on the bottom button Open.

7. Then click on the language with locale you want. Then click on Add.

8. Then, you're back on the first screen of add a language

9. Click on the link option on the right of your language

10. Then click on the first link, which should be "Download and Install language pack" or "set as primary language".

11. On next login, Windows will be in the language you want.