Firstly, download FTB launcher Client with this link ==> http://www.feed-the-beast.com/
1. Choose the FTB infinity Evolved modpack.
2. Select a version for me it's v2.4.2.
3. Click launch to download it.
Connect to your control panel to change your modpack.
4. Click on the "MAINTENANCE" panel.
5. Click on the "REINSTALL" button to have access to all the packs. (Your current data will be deleted).
6. Select the FTB modpacks icon.
7. And "CONFIRM".
8. Select Infinity Evolved 17 modpack.
9. CONFIRM your selection.
10. Choose the same version than the FTB launcher on your computer.
11. CONFIRM the infinity Evolved 17 installation.
You need to wait during the installation.
Don't forgot to put JAVA 8 it's very important.
12. Finally start your server.