I use this convertor and it is very good.

But I can't use it with Ghostscript option enabled.
I have the latest version of ghsotscript installed, but the program returns errors when I try to convert with Ghostscript option enabled.
I see 4 error allersts with the following content:
1) GPL ghostscript
2) 8.62
3) :
4) Urecoverable error, exit code 1
Can anybody help to fix this problem?
And does Ghostscript actually give better quality?