[yener90]

REV0
you know it will not bring anything
-> Languages: eng change^^

-> your gameupdate languages registry are wrong.
The GameUpdater doesnt support so much languages.
Look at Resources in Assassins Creed 3 Folder.
You can see on the folder names which are supported.

Try those values:

[Registry]
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed ® III 1.01\1.01"; Flags: uninsdeletekey;
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: InstallDir; ValueData: {app}; ValueType: string; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: English; ValueType: string; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: French; ValueType: string; Languages: fre; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Italian; ValueType: string; Languages: ita; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: German; ValueType: string; Languages: ger; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Spanish; ValueType: string; Languages: esp; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Russian; ValueType: string; Languages: rus; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Polish; ValueType: string; Languages: pol; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: ChineseTrad; ValueType: string; Languages: cnt; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Hungarian; ValueType: string; Languages: hun; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Czech; ValueType: string; Languages: cze; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Dutch; ValueType: string; Languages: ndl; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Danish; ValueType: string; Languages: dan; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Norwegian; ValueType: string; Languages: nor; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Swedish; ValueType: string; Languages: swe; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Portuguese; ValueType: string; Languages: porbr; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Brazil; ValueType: string; Languages: por; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3"; ValueName: Language; ValueData: Finnish; ValueType: string; Languages: fin; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: execPath; ValueData: {app}\AC3SP.exe; ValueType: string; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: info; ValueData: c8756eaa3e624090a7004c7c386c8e77; ValueType: string; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: installdir; ValueData: {app}; ValueType: string; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: us; ValueType: string; Flags: uninsdeletekey;  
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: de; ValueType: string; Languages: ger; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: es; ValueType: string; Languages: esp; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: fr; ValueType: string; Languages: fre; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: it; ValueType: string; Languages: ita; Flags: uninsdeletekey; 
Root: HKLM; SubKey: "SOFTWARE\Ubisoft\Assassin's Creed 3\GameUpdate"; ValueName: language; ValueData: nl; ValueType: string; Languages: ndl; Flags: uninsdeletekey;

i used english on my installation, did work.