Function at 0x4033a2
Capabilities:
Accept command line arguments
Check os version
Copy file
Delete file
Get common file path
Get file attributes
Get file system object information
Set current directory
Set environment variable
Shutdown system
Terminate process

Disassembly:
push ebp
mov ebp, esp
sub esp, 0x224
push esi
push edi
xor edi, edi
push 0x8001
mov dword [ebp - 0x14], edi
mov dword [ebp - 0xc], str.Error_writing_temporary_file._Make_sure_your_temp_folder_is_valid.
mov dword [ebp - 8], edi
mov byte [ebp - 4], 0x20
call dword [sym.imp.KERNEL32.dll_SetErrorMode]
mov esi, dword [sym.imp.KERNEL32.dll_GetVersionExA]
lea eax, [ebp - 0xc4]
push eax
mov dword [ebp - 0xb0], edi
mov dword [ebp - 0x30], edi
mov dword [ebp - 0x2c], edi
mov dword [ebp - 0xc4], 0x9c
call esi
test eax, eax
jne 0x403433
lea eax, [ebp - 0xc4]
mov dword [ebp - 0xc4], 0x94
push eax
call esi
cmp dword [ebp - 0xb4], 2
jne 0x40343a
movsx cx, byte [ebp - 0xa3]
mov al, byte [ebp - 0xb0]
sub ecx, 0x30
sub al, 0x53
mov byte [ebp - 0x2a], 4
neg al
sbb eax, eax
not eax
and eax, ecx
mov word [ebp - 0x30], ax
cmp dword [ebp - 0xb4], 2
jae 0x40345e
and byte [ebp - 0x2a], 0
cmp byte [ebp - 0xaf], 0x41
jl 0x40345a
movsx ax, byte [ebp - 0xaf]
sub eax, 0x40
mov word [ebp - 0x30], ax
jmp 0x40345e
mov word [ebp - 0x30], di
cmp dword [ebp - 0xc0], 0xa
jae 0x40346f
and word [ebp - 0xb6], 0
mov eax, dword [ebp - 0xb8]
movzx ecx, byte [ebp - 0xbc]
mov dword [0x4243d8], eax
xor eax, eax
mov ah, byte [ebp - 0xc0]
movzx eax, ax
or eax, ecx
xor ecx, ecx
mov ch, byte [ebp - 0x30]
movzx ecx, cx
shl eax, 0x10
or eax, ecx
movzx ecx, byte [ebp - 0x2a]
or eax, ecx
mov dword [0x4243dc], eax
cmp word [0x4243de], 0x600
je 0x4034c2
push edi
call fcn.0040667f
cmp eax, edi
je 0x4034c2
push 0xc00
call eax
mov esi, str.UXTHEME
push esi
call fcn.00406611
push esi
call dword [sym.imp.KERNEL32.dll_lstrlenA]
lea esi, [esi + eax + 1]
cmp byte [esi], 0
jne 0x4034c7
push 0xc
call fcn.0040667f
push 0xa
call fcn.0040667f
push 8
mov dword [0x424324], eax
call fcn.0040667f
cmp eax, edi
je 0x40350a
push 0x1e
call eax
test eax, eax
je 0x40350a
or byte [0x4243dc], 0x80
push ebx
call dword [sym.imp.COMCTL32.dll_InitCommonControls]
push edi
call dword [sym.imp.ole32.dll_OleInitialize]
mov dword [0x4243e0], eax
push edi
lea eax, [ebp - 0x224]
push 0x160
push eax
push edi
push 0x41f8e0
call dword [sym.imp.SHELL32.dll_SHGetFileInfoA]
push str.NSIS_Error
push 0x423b20
call fcn.00406257
call dword [sym.imp.KERNEL32.dll_GetCommandLineA]
mov ebx, 0x42a000
push eax
push ebx
call fcn.00406257
cmp byte [0x42a000], 0x22
mov dword [0x424320], 0x400000
mov eax, ebx
jne 0x403575
mov byte [ebp - 4], 0x22
mov eax, 0x42a001
push dword [ebp - 4]
push eax
call fcn.00405c14
push eax
call dword [sym.imp.USER32.dll_CharNextA]
mov dword [ebp - 0x10], eax
jmp 0x403649
cmp cl, 0x20
jne 0x403598
inc eax
cmp byte [eax], 0x20
je 0x403592
cmp byte [eax], 0x22
mov byte [ebp - 4], 0x20
jne 0x4035a6
inc eax
mov byte [ebp - 4], 0x22
cmp byte [eax], 0x2f
jne 0x40363a
inc eax
cmp byte [eax], 0x53
jne 0x4035cb
mov cl, byte [eax + 1]
cmp cl, 0x20
je 0x4035c1
test cl, cl
jne 0x4035cb
mov dword [0x4243c0], 1
movsx ecx, byte [0x40a177]
movsx edx, byte [0x40a176]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a175]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.NCRC]
shl ecx, 8
or ecx, edx
cmp dword [eax], ecx
jne 0x40360a
mov cl, byte [eax + 4]
cmp cl, 0x20
je 0x403606
test cl, cl
jne 0x40360a
or dword [ebp - 8], 4
movsx ecx, byte [0x40a16f]
movsx edx, byte [0x40a16e]
shl ecx, 8
or ecx, edx
movsx edx, byte [0x40a16d]
shl ecx, 8
or ecx, edx
movsx edx, byte [str.__D]
shl ecx, 8
or ecx, edx
cmp dword [eax - 2], ecx
je 0x403655
push dword [ebp - 4]
push eax
call fcn.00405c14
cmp byte [eax], 0x22
jne 0x403649
inc eax
mov cl, byte [eax]
test cl, cl
jne 0x40358d
jmp 0x403667
and byte [eax - 2], 0
add eax, 2
push eax
push 0x42a400
call fcn.00406257
mov edi, dword [sym.imp.KERNEL32.dll_GetTempPathA]
mov esi, 0x42b400
push esi
push 0x400
call edi
call fcn.00403371
test eax, eax
jne 0x4036d9
push 0x3fb
push esi
call dword [sym.imp.KERNEL32.dll_GetWindowsDirectoryA]
push str.Temp
push esi
call sub.KERNEL32.dll_lstrcatA
call fcn.00403371
test eax, eax
jne 0x4036d9
push esi
push 0x3fc
call edi
push 0x40a160
push esi
call sub.KERNEL32.dll_lstrcatA
mov edi, dword [sym.imp.KERNEL32.dll_SetEnvironmentVariableA]
push esi
push str.TEMP
call edi
push esi
push 0x40a154
call edi
call fcn.00403371
test eax, eax
je 0x403784
push 0x42b000
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
push dword [ebp - 8]
call fcn.00402f31
test eax, eax
mov dword [ebp - 0xc], eax
jne 0x403784
cmp dword [0x42433c], eax
je 0x403775
push eax
push ebx
call fcn.00405c14
mov edi, eax
cmp edi, ebx
jb 0x403740
movsx eax, byte [0x40a14f]
movsx ecx, byte [0x40a14e]
shl eax, 8
or eax, ecx
movsx ecx, byte [0x40a14d]
shl eax, 8
or eax, ecx
movsx ecx, byte [str.___]
shl eax, 8
or eax, ecx
cmp dword [edi], eax
je 0x403740
dec edi
cmp edi, ebx
jae 0x403737
cmp edi, ebx
mov dword [ebp - 0xc], str.Error_launching_installer
jb 0x4037b0
and byte [edi], 0
add edi, 4
push edi
call fcn.00405cd7
test eax, eax
je 0x403784
push edi
push 0x42a400
call fcn.00406257
push edi
push 0x42a800
call fcn.00406257
and dword [ebp - 0xc], 0
or dword [0x4243cc], 0xffffffff
call fcn.00403a60
mov dword [ebp - 0x14], eax
call fcn.00403986
call dword [sym.imp.ole32.dll_OleUninitialize]
xor edi, edi
pop ebx
cmp dword [ebp - 0xc], edi
je 0x4038f2
push 0x200010
push dword [ebp - 0xc]
call fcn.0040596d
push 2
call dword [sym.imp.KERNEL32.dll_ExitProcess]
call fcn.004058d8
push esi
mov dword [ebp - 0x18], eax
call sub.KERNEL32.dll_lstrlenA
push dword [ebp - 0x10]
mov edi, eax
push section..ndata
call fcn.00406257
cmp byte [0x42a400], 0
jne 0x4037e5
push 0x42ac00
push 0x42a400
call fcn.00406257
lea eax, [edi + 0x42b400]
mov dword [ebp - 8], 1
mov dword [ebp - 0x10], eax
mov edi, 0x426400
mov ebx, 0x426800
and dword [ebp - 4], 0
movzx eax, word [ebp - 8]
push eax
push str.nsu_X.tmp
push dword [ebp - 0x10]
call dword [sym.imp.USER32.dll_wsprintfA]
mov eax, dword [0x424330]
add esp, 0xc
push dword [eax + 0x120]
push edi
call fcn.004062ea
cmp dword [ebp - 0x18], 0
push esi
je 0x403838
call fcn.00405861
jmp 0x40383d
call fcn.004058bb
test eax, eax
je 0x403879
push edi
call dword [sym.imp.KERNEL32.dll_GetFileAttributesA]
test ah, 4
jne 0x40386a
push edi
call dword [sym.imp.KERNEL32.dll_DeleteFileA]
test eax, eax
je 0x40386a
push 1
push esi
call fcn.00405a19
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
je 0x403803
inc dword [ebp - 8]
cmp word [ebp - 8], 0
jne 0x4037ff
jmp 0x403784
push esi
call dword [sym.imp.KERNEL32.dll_SetCurrentDirectoryA]
push 0
push esi
call fcn.00406030
push 1
push edi
push 0x42bc00
call dword [sym.imp.KERNEL32.dll_CopyFileA]
test eax, eax
je 0x403784
push 0
push edi
call fcn.00406030
mov eax, dword [0x424330]
push dword [eax + 0x124]
push ebx
call fcn.004062ea
push ebx
call fcn.004058f0
test eax, eax
jne 0x4038e2
mov eax, dword [ebp - 4]
inc dword [ebp - 4]
test eax, eax
jne 0x403784
push edi
call fcn.004065ea
test eax, eax
je 0x403803
jmp 0x403784
push eax
call dword [sym.imp.KERNEL32.dll_CloseHandle]
and dword [ebp - 0xc], 0
jmp 0x403784
cmp dword [0x4243b4], edi
je 0x403970
lea eax, [ebp - 0x18]
push eax
push 0x28
call dword [sym.imp.KERNEL32.dll_GetCurrentProcess]
push eax
call dword [sym.imp.ADVAPI32.dll_OpenProcessToken]
test eax, eax
je 0x403940
lea eax, [ebp - 0x24]
push eax
push str.SeShutdownPrivilege
push edi
call dword [sym.imp.ADVAPI32.dll_LookupPrivilegeValueA]
push edi
push edi
lea eax, [ebp - 0x28]
push edi
push eax
push edi
push dword [ebp - 0x18]
mov dword [ebp - 0x28], 1
mov dword [ebp - 0x1c], 2
call dword [sym.imp.ADVAPI32.dll_AdjustTokenPrivileges]
push 4
call fcn.0040667f
cmp eax, edi
mov esi, 0x80040002
je 0x40395c
push esi
push 0x25
push edi
push edi
push edi
call eax
test eax, eax
je 0x403969
push esi
push 2
call dword [sym.imp.USER32.dll_ExitWindowsEx]
test eax, eax
jne 0x403970
push 9
call fcn.0040140b
mov eax, dword [0x4243cc]
cmp eax, 0xffffffff
je 0x40397d
mov dword [ebp - 0x14], eax
push dword [ebp - 0x14]
call dword [sym.imp.KERNEL32.dll_ExitProcess]