@echo off
for /f "usebackq delims== tokens=2" %%x in (`wmic logicaldisk where "DeviceID='C:'" get FreeSpace /format:value`) do set "FreeSpace=%%x"
IF /i %FreeSpace% GTR "2147483648" (ECHO C Drive Has Enough Available Disk For Install %FreeSpace%) else (ECHO C Drive Is FULL %FreeSpace%)

@echo off
setlocal
set "pad=000000000000000"
set "NeededSpace=%pad%4294967296"
for /f "delims== tokens=2" %%x in (
  'wmic logicaldisk where "DeviceID='C:'" get FreeSpace /format:value'
) do for %%y in (%%x) do set "FreeSpace=%pad%%%y"
if "%FreeSpace:~-15%" geq "%NeededSpace:~-15%" echo Drive has at least 4 GB free space.

@ECHO off
SETLOCAL EnableDelayedExpansion
FOR /f "usebackq delims== tokens=2" %%x IN (`wmic logicaldisk where "DeviceID='C:'" get FreeSpace /format:value`) DO SET "FreeSpaceBig=%%x"
SET FreeSpace=!FreeSpaceBig:~0,-7!
IF %FreeSpace% GTR 2147 (ECHO C Drive Has Enough Available Disk For Install %FreeSpace%) else (ECHO C Drive Is FULL %FreeSpace%)
ENDLOCAL

for /f "tokens=3" %%a in ('dir T:') do (
 set bytesfree=%%a
)
ECHO %bytesfree%>x&FOR %%? IN (x) DO SET /A strlen=%%~z? - 2&del x
IF %strlen% LEQ 13 (

)