Hi,
the SRECCONV_v2.exe is command line tool. So, run the CMD shell (c:\windows\system32\cmd.exe) and type:
srecconv_v2.exe input.mot output.mot
input.mot is s-record file which you want to convert. output.mot is s-record file which will be created by the tool.
Then you will get a message if the conversion has been successful or not.
Regarding difference between VLE and BOOKE - for example here:
https://community.nxp.com/thread/453600
Regards,
Lukas