Notes/Domino 6 and 7 Forum : Server upgrade to 6.01

When I want to apply the installer on my 6.0 Server, which is recognized, I have the following:

Iris Hotfix Installer FI1.01 for W32Intel
Copyright (c) Iris Associates, Inc., 1994-1999. All rights reserved.
Executable created 16:45:13 Jan 27 2003 for (null).
Upgrade started at 13:43:14 Feb 15 2003 in D:\Data\Shared\Downloads\Lotus Notes\V-6.0 Gold\Win32\mru 6.01.

Using Notes program directory D:\APPS\LOTUS\DOMINO
Using Notes data directory D:\APPS\LOTUS\DOMINO\DATA
D:\APPS\LOTUS\DOMINO\nstrings.dll
Identified Release 6.0|September 26, 2002.
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_JAVA_APPLETS.exe failed checksum. (Found 0x17a100f1, Expected 0x875d016e)
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_English.exe failed checksum. (Found 0xb0d3e295, Expected 0x50031854)
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_LOTUS_SCRIPT.exe failed checksum. (Found 0x644a8864, Expected 0xd1ae1b3f)
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_MAPI.exe failed checksum. (Found 0xc947ed54, Expected 0x74fced69)
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_SEARCH.exe failed checksum. (Found 0xd5e69c12, Expected 0x95cc8027)
File D:\APPS\LOTUS\DOMINO\DATA\domino\html\download\filesets\n_SHIMMER.exe failed checksum. (Found 0x84745436, Expected 0x8ee73d4e)
Unable to verify release.

What's wrong, any idea ?