1. Save your WTF and Interface folders in case something goes wrong

2. Copy the WTF and Interface folder from SamadinUI into your WoW folder

3. Rename ACCOUNTNAME, SERVERNAME and CHARNAME inside the WTF folder to respective names

4. On your login screen, click Addons and pick Load out of date addons

5. When you log in, type /reflux switch SamadinUI

If something's still not as it should be, go into profiles on that addon and set it to Default or SamadinUI

NB! You are copying my config file, you might have to copy your old config file and replace it with mine if you don't like it the way it is,
this should not affect the UI in any way regardless.