Function at 0x403c75
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
sub esp, 0x3ec
and dword [esp], 0
push ebx
push ebp
push esi
push edi
push 0x20
pop eax
push 0x8001
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [esp + 0x1c], eax
xor ebp, ebp
mov ebx, eax
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
and dword [esp + 0x40], ebp
lea eax, [esp + 0x2c]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
xorps xmm0, xmm0
push eax
movlpd qword [esp + 0x144], xmm0
mov dword [esp + 0x30], 0x11c
call esi
test eax, eax
jne 0x403cfe
lea eax, [esp + 0x2c]
mov dword [esp + 0x2c], 0x114
push eax
call esi
push 0x53
pop eax
mov dl, 4
mov byte [esp + 0x146], dl
cmp word [esp + 0x40], ax
jne 0x403cfa
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x403d05
xor eax, eax
jmp 0x403cf0
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x403d17
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x403d1b
mov eax, dword [esp + 0x38]
movzx ecx, byte [esp + 0x30]
shl ecx, 8
mov dword [0x42adf8], eax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ecx, 8
or ecx, eax
movzx eax, dl
shl ecx, 8
or ecx, eax
mov eax, 0x600
mov dword [0x42adfc], ecx
cmp word [0x42adfe], ax
je 0x403d6a
push 0
call fcn.00406ded
test eax, eax
je 0x403d6a
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.0040668c
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], 0
jne 0x403d6f
push 0xb
call fcn.00406ded
push 9
call fcn.00406ded
push 7
mov dword [0x429cf0], eax
call fcn.00406ded
test eax, eax
je 0x403db1
push 0x1e
call eax
test eax, eax
je 0x403db1
or byte [0x42adfc], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
xor esi, esi
push esi
call dword [sym.imp.ole32.dll_OleInitialize]
push esi
push 0x2b4
mov dword [0x42ad60], eax
lea eax, [esp + 0x150]
push eax
push esi
push 0x4095c8
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x429d00
call fcn.0040702b
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
mov esi, 0x435000
push esi
call fcn.0040702b
push 0x22
mov eax, esi
mov dword [0x429cf4], 0x400000
pop esi
cmp word [0x435000], si
jne 0x403e1f
mov ebx, esi
mov eax, 0x435002
push ebx
push eax
call fcn.00406b01
push eax
call dword [sym.imp.USER32.dll_CharNextW]
push 2
mov dword [esp + 0x18], eax
pop ebx
jmp 0x403ebe
push 0x20
pop edx
cmp cx, dx
jne 0x403e48
add eax, ebx
cmp word [eax], dx
je 0x403e41
cmp word [eax], si
jne 0x403e51
add eax, ebx
mov edx, esi
cmp word [eax], 0x2f
jne 0x403eb0
add eax, ebx
push 0x53
pop ecx
cmp word [eax], cx
jne 0x403e7b
movzx ecx, word [eax + 2]
cmp cx, word [esp + 0x18]
je 0x403e71
test cx, cx
jne 0x403e7b
mov dword [0x42ade0], 1
cmp dword [eax], 0x43004e
jne 0x403e9f
cmp dword [eax + 4], 0x430052
jne 0x403e9f
movzx ecx, word [eax + 8]
cmp cx, word [esp + 0x18]
je 0x403e9c
test cx, cx
jne 0x403e9f
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403eb0
cmp dword [eax], 0x3d0044
je 0x403ecc
push edx
push eax
call fcn.00406b01
cmp word [eax], si
jne 0x403ebe
add eax, ebx
movzx ecx, word [eax]
test cx, cx
jne 0x403e39
jmp 0x403ee0
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x435800
call fcn.0040702b
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov ebx, 0x437800
push ebx
push 0x400
call esi
call fcn.004041c6
test eax, eax
jne 0x403f52
push 0x3fb
push ebx
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push ebx
call sub.KERNEL32.dll_lstrcatW
call fcn.004041c6
test eax, eax
jne 0x403f52
push ebx
push 0x3fc
call esi
push 0x4095f0
push ebx
call sub.KERNEL32.dll_lstrcatW
mov esi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableW]
push ebx
push str.TEMP
call esi
push ebx
push 0x409604
call esi
call fcn.004041c6
test eax, eax
je 0x4040fb
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x437000
call ebx
push ebp
call fcn.004037f7
mov edi, eax
test edi, edi
jne 0x4040fb
cmp dword [0x42ad0c], eax
je 0x403fd6
push eax
mov ebp, 0x435000
push ebp
call fcn.00406b01
mov esi, eax
jmp 0x403f9b
cmp dword [esi], 0x5f0020
jne 0x403f98
cmp dword [esi + 4], 0x3d003f
je 0x403f9f
sub esi, 2
cmp esi, ebp
jae 0x403f87
mov edi, str.Error_launching_installer
cmp esi, ebp
jb 0x403fe9
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.00406b39
test eax, eax
je 0x4040fb
push esi
push 0x435800
call fcn.0040702b
push esi
push 0x436000
call fcn.0040702b
xor edi, edi
or dword [0x42adec], 0xffffffff
call fcn.00405f0f
mov ebx, eax
jmp 0x4040ff
call fcn.00406a05
push str.nsu
mov ebp, 0x437800
mov esi, eax
push ebp
call sub.KERNEL32.dll_lstrcatW
test esi, esi
je 0x40400f
push 0x409618
push ebp
call sub.KERNEL32.dll_lstrcatW
push 0x40961c
push ebp
call sub.KERNEL32.dll_lstrcatW
push 0x436800
push ebp
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x4040fb
push ebp
test esi, esi
je 0x40403a
call fcn.00406326
jmp 0x40403f
call fcn.00406306
push ebp
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x435800], 0
jne 0x40405f
push 0x436800
push 0x435800
call fcn.0040702b
push dword [esp + 0x14]
push section..ndata
call fcn.0040702b
push 0x1a
mov dword [0x42b800], 0x41
pop esi
mov eax, dword [0x42ad18]
push dword [eax + 0x120]
push 0x4219c8
call fcn.004063a4
push 0x4219c8
call ebx
test edi, edi
je 0x4040e8
push 1
push 0x4219c8
push 0x438800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x4040e8
push 0
push 0x4219c8
call fcn.0040672d
mov eax, dword [0x42ad18]
push dword [eax + 0x124]
push 0x4219c8
call fcn.004063a4
push 0x4219c8
call fcn.00406bd9
test eax, eax
je 0x4040e8
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
xor edi, edi
inc word [0x42b800]
sub esi, 1
jne 0x40407a
push esi
push ebp
call fcn.0040672d
mov ebx, dword [esp + 0x10]
call fcn.00403c4b
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x404121
push 0x200010
push edi
call fcn.00406fb9
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x42add4], 0
je 0x4041b2
lea eax, [esp + 0x14]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x40417f
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push 0
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push 0
push 0
push 0
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push 0
push dword [esp + 0x28]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.00406ded
mov esi, 0x80040002
test eax, eax
je 0x40419e
push esi
push 0x25
push 0
push 0
push 0
call eax
test eax, eax
je 0x4041ab
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x4041b2
push 9
call fcn.00401549
cmp dword [0x42adec], 0xffffffff
cmovne ebx, dword [0x42adec]
push ebx
jmp 0x40411b