Available online
here.
Also, the RPCNA has an edition of the WCF which has the original and modern English versions parallel with the RP Testimony available
here.
Rowland Ward prepared a modernised [sic] version of the WCF in 1996. His study guide on the WCF uses that text and it is available
here.
Douglas Kelly prepared a modernized version of the WCF which is available
here.
My best recommendation: the original Westminster Standards as published by the Free Presbyterian Church of Scotland available
here.