I compiled HEAD branch of https://github.com/Bufius/vertminer-gpu.git on Fedora 19, but didn't look at the NEWS file, so didn't see that now the --scrypt option means litecoin scrypt, and I was getting 100% rejects.  As soon as I changed the option to --nscrypt, I started getting 100% accepts.

I doubt there are any precompiled versions.  I don't run windows.

diff --git a/NEWS b/NEWS
index b1b30a5..5c935d3 100644
--- a/NEWS
+++ b/NEWS
@@ -1,3 +1,10 @@
+Version 0.5.4pre2 - 12 February 2014
+- include more ADL6 stuff
+- prepared miner to mine scrypt and nfactor scrypt
+  --> option --scrypt => normal scrypt
+  --> option --nscrypt => nfactor scrypt (e.g. vertcoin)
+
+


--- a/README
+++ b/README
@@ -192,7 +192,8 @@ Options for both config file and command line:
 --scan-time|-s Upper bound on time spent scanning current work, in seconds (default: 60)
 --sched-start Set a time of day in HH:MM to start mining (a once off without a stop time)
 --sched-stop   Set a time of day in HH:MM to stop mining (will quit without a start time)
---scrypt-vert       Use the scrypt algorithm for mining (vertcoin only)
+--scrypt            Use the scrypt algorithm for mining (NORMAL scrypt coins only)
+--nscrypt           Use the adaptive nfactorscrypt algorithm for mining (NFACTOR based scrypt coins only)
 --sharelog     Append share log to file
 --shares       Quit after mining N shares (default: unlimited)
 --socks-proxy Set socks4 proxy (host:port) for all pools without a proxy specified