I'm not sure if this is 100% correctly done but it works for me.
Please correct me here if anything is wrong.
** Backup your 0_text.afs just in case **
1) Extract the 'WE8I Vuelta del Lobo Patch Update1.afp' file from your RAR archive, to any directory on your hard drive
2) Open AFS Explorer 3.6
3) Select 'File' then select 'Import AFS file...'
4) Browse to the directory on your hard drive where WE8:I is installed (eg. C
Program Files\Konami\Winning Eleven 8\) and then open the 'dat' folder and choose the file '0_text.afs'
5) Wait for the AFS file to be loaded
6) Select 'Advanced' then select 'Import patch...'
7) Browse to the directory where you extracted the 'WE8I Vuelta del Lobo Patch Update1.afp' file and import it.
8) AFS explorer will pop up a message saying something about temporal storage is needed, just click 'Yes'
9) AFS explorer will ask you if you want to load another afp patch, just click 'No'
10) AFS explorer will now pop up a window where you can choose what files you want to be patched with. Just click on 'Patch!' (If you want to have your Master League patched, tick the 'para_we8.bin' option and then click on 'Patch!')
11) AFS explorer will now ask you if you want rebuild the AFS file in order to save some unused space. It's not neccessary so if you don't want to, just click 'NO' and you're done otherwise, Click 'YES' and follow steps 16 - 24 below.
12) Log Window will pop up. Just wait for the files to finish
13) On the lower left side in AFS Explorer you will see a nice message saying: "AFS-Patch successfully applied!"
14) Exctract the 'save' folder from the RAR archive, to your /Winning Eleven 8I/save/folder1 (overwriting the existing one)
15) You're done
Rebuilding the AFS file
** Backup your 0_text.afs just in case **
16) When AFS explorer asks you if you want to rebuild the AFS file, click 'YES'
17) Message will pop up asking you what you want to name the new AFS file, just click 'OK'
18) Browse to your /Winning Eleven 8I/dat/ directory and name the file '0_text1.afs' and then click on 'Save'
19) Wait for the file to be built (Might take a while)
20) Message will pop up saying: "AFS regenerated successfully! Now files will be udpated", just click 'OK'
21) Log window will pop up listing many files being imported. When it's all done, the log window will say: "Patch imported!" You may now click 'OK'
22) Close AFS Explorer and browse to your /Winning Eleven 8I/dat/ directory.
23) Delete your '0_text.afs' file and then rename the '0_text1.afs' file you've just created, to '0_text.afs'.
24) You're Done