Function at 0x403804
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
push ebx
push ebp
push esi
push edi
xor ebx, ebx
mov edi, str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
push 0x8001
mov dword [esp + 0x14], ebx
mov ebp, ebx
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExW]
lea eax, [esp + 0x2c]
xorps xmm0, xmm0
mov dword [esp + 0x40], ebx
push eax
movlpd qword [esp + 0x144], xmm0
mov dword [esp + 0x30], 0x11c
call esi
test eax, eax
jne 0x403886
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 0x403882
mov eax, dword [esp + 0x5a]
add eax, 0xffffffd0
mov word [esp + 0x140], ax
jmp 0x40388d
xor eax, eax
jmp 0x403878
mov dl, byte [esp + 0x146]
cmp dword [esp + 0x30], 0xa
jae 0x40389f
movzx eax, word [esp + 0x38]
mov dword [esp + 0x38], eax
jmp 0x4038a3
mov eax, dword [esp + 0x38]
mov dword [0x429e18], eax
movzx eax, byte [esp + 0x30]
shl ax, 8
movzx ecx, ax
movzx eax, byte [esp + 0x34]
or ecx, eax
movzx eax, byte [esp + 0x140]
shl ax, 8
shl ecx, 0x10
movzx eax, ax
or ecx, eax
movzx eax, dl
or ecx, eax
mov eax, 0x600
mov dword [0x429e1c], ecx
sar ecx, 0x10
cmp cx, ax
je 0x4038f8
push ebx
call fcn.004069ee
test eax, eax
je 0x4038f8
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.004062a6
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
inc esi
add esi, eax
cmp byte [esi], bl
jne 0x4038fd
push 0xb
call fcn.004069ee
push 9
call fcn.004069ee
push 7
mov dword [0x428d10], eax
call fcn.004069ee
test eax, eax
je 0x40393e
push 0x1e
call eax
test eax, eax
je 0x40393e
or byte [0x429e1c], 0x80
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push ebx
call dword [sym.imp.ole32.dll_OleInitialize]
push ebx
push 0x2b4
mov dword [0x429d80], eax
lea eax, [esp + 0x150]
push eax
push ebx
push 0x4085d4
call dword [sym.imp.SHELL32.dll_SHGetFileInfoW]
push str.NSIS_Error
push 0x428d20
call fcn.00406c22
call dword [sym.imp.KERNEL32.dll_GetCommandLineW]
push eax
push 0x434000
call fcn.00406c22
movzx ecx, word [0x434000]
mov edx, 0x434002
push 0x22
pop esi
push 0x20
pop ebx
cmp cx, si
mov dword [0x428d14], 0x400000
mov eax, esi
mov dword [esp + 0x18], esi
cmovne eax, ebx
movzx eax, ax
push eax
mov eax, 0x434000
cmove eax, edx
push eax
call fcn.004066fe
push eax
call dword [sym.imp.USER32.dll_CharNextW]
mov ecx, eax
mov dword [esp + 0x14], ecx
movzx eax, word [ecx]
test ax, ax
je 0x403ab2
mov esi, eax
movzx eax, si
cmp si, bx
jne 0x4039f2
add ecx, 2
movzx eax, word [ecx]
cmp ax, bx
je 0x4039e7
movzx esi, ax
movzx edx, ax
cmp ax, word [esp + 0x18]
jne 0x403a08
movzx edx, word [ecx + 2]
push 0x22
pop eax
mov ebx, eax
cmp si, word [esp + 0x18]
lea eax, [ecx + 2]
cmovne eax, ecx
cmp dx, 0x2f
jne 0x403a72
push 0x53
add eax, 2
pop ecx
push 0x20
pop edx
cmp word [eax], cx
jne 0x403a3f
movzx ecx, word [eax + 2]
cmp cx, dx
je 0x403a35
test cx, cx
jne 0x403a3f
mov dword [0x429e00], 1
cmp dword [eax], 0x43004e
jne 0x403a61
cmp dword [eax + 4], 0x430052
jne 0x403a61
movzx ecx, word [eax + 8]
cmp cx, dx
je 0x403a5e
test cx, cx
jne 0x403a61
or ebp, 4
cmp dword [eax - 4], 0x2f0020
jne 0x403a72
cmp dword [eax], 0x3d0044
je 0x403a9e
push ebx
push eax
call fcn.004066fe
mov ecx, eax
push 0x22
pop ebx
movzx eax, word [ecx]
mov edx, eax
cmp ax, bx
jne 0x403a8e
add ecx, 2
movzx edx, word [ecx]
movzx esi, dx
test dx, dx
je 0x403ab2
push 0x20
pop ebx
jmp 0x4039df
xor ecx, ecx
mov word [eax - 4], cx
add eax, 4
push eax
push 0x434800
call fcn.00406c22
mov esi, dword [sym.imp.KERNEL32.dll_GetTempPathW]
mov ebx, 0x436800
push ebx
push 0x400
call esi
call fcn.00403dad
test eax, eax
jne 0x403b24
push 0x3fb
push ebx
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryW]
push str.Temp
push ebx
call sub.KERNEL32.dll_lstrcatW
call fcn.00403dad
test eax, eax
jne 0x403b24
push ebx
push 0x3fc
call esi
push 0x4085fc
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 0x408610
call esi
call fcn.00403dad
test eax, eax
je 0x403cec
mov ebx, dword [sym.imp.KERNEL32.dll_DeleteFileW]
push 0x436000
call ebx
push ebp
call fcn.0040348f
mov edi, eax
xor ebp, ebp
test edi, edi
jne 0x403cee
cmp dword [0x429d24], ebp
je 0x403bae
push ebp
push 0x434000
call fcn.004066fe
mov esi, eax
mov eax, 0x434000
jmp 0x403b73
cmp dword [esi], 0x5f0020
jne 0x403b70
cmp dword [esi + 4], 0x3d003f
je 0x403b77
sub esi, 2
cmp esi, eax
jae 0x403b5f
mov edi, str.Error_launching_installer
cmp esi, eax
jb 0x403bc1
xor eax, eax
mov word [esi], ax
add esi, 8
push esi
call fcn.00406740
test eax, eax
je 0x403ce8
push esi
push 0x434800
call fcn.00406c22
push esi
push 0x435000
call fcn.00406c22
mov edi, ebp
or dword [0x429e0c], 0xffffffff
call fcn.00405b46
mov ebx, eax
jmp 0x403cf2
call fcn.00406604
push str.nsu
push 0x436800
mov esi, eax
call sub.KERNEL32.dll_lstrcatW
test esi, esi
je 0x403bea
push 0x408624
push 0x436800
call sub.KERNEL32.dll_lstrcatW
push 0x408628
push 0x436800
call sub.KERNEL32.dll_lstrcatW
push 0x435800
push 0x436800
call dword [sym.imp.KERNEL32.dll_lstrcmpiW]
test eax, eax
je 0x403ce8
push 0x436800
test esi, esi
je 0x403c21
call fcn.00405f46
jmp 0x403c26
call fcn.00405f26
push 0x436800
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryW]
cmp word [0x434800], bp
jne 0x403c49
push 0x435800
push 0x434800
call fcn.00406c22
push dword [esp + 0x14]
push section..ndata
call fcn.00406c22
push 0x1a
mov dword [0x42a800], 0x41
pop esi
mov eax, dword [0x429d30]
push dword [eax + 0x120]
push 0x4209d0
call fcn.00405fc2
push 0x4209d0
call ebx
test edi, edi
je 0x403cd1
push 1
push 0x4209d0
push 0x437800
call dword [sym.imp.KERNEL32.dll_CopyFileW]
test eax, eax
je 0x403cd1
push ebp
push 0x4209d0
call fcn.00406345
mov eax, dword [0x429d30]
push dword [eax + 0x124]
push 0x4209d0
call fcn.00405fc2
push 0x4209d0
call fcn.004067de
test eax, eax
je 0x403cd1
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
mov edi, ebp
inc word [0x42a800]
sub esi, 1
jne 0x403c64
push ebp
push 0x436800
call fcn.00406345
mov ebx, ebp
jmp 0x403cf2
xor ebp, ebp
mov ebx, dword [esp + 0x10]
call fcn.004037c2
call dword [sym.imp.ole32.dll_OleUninitialize]
test edi, edi
je 0x403d14
push 0x200010
push edi
call fcn.00406bb0
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
cmp dword [0x429df4], 0
je 0x403d99
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 0x403d69
lea eax, [esp + 0x20]
push eax
push str.SeShutdownPrivilege
push ebp
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueW]
push ebp
push ebp
push ebp
lea eax, [esp + 0x28]
mov dword [esp + 0x28], 1
push eax
push ebp
push dword [esp + 0x28]
mov dword [esp + 0x40], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.004069ee
mov esi, 0x80040002
test eax, eax
je 0x403d85
push esi
push 0x25
push ebp
push ebp
push ebp
call eax
test eax, eax
je 0x403d92
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403d99
push 9
call fcn.00401533
cmp dword [0x429e0c], 0xffffffff
cmovne ebx, dword [0x429e0c]
push ebx
jmp 0x403d0e