Vcheck.wbt requires elevated admin privileges or it will not install an extender but that has been the case for at least 10 years. This may explain your account issue.
I downloaded a fresh copy of vcheck.zip, unzipped it to my existing vcheck directory and it worked as expected - whether from the shell or WinBatch Studio. Not being one to be deterred, I decided to installed it into an empty directory. Voile! Infinite loop with no WinBatch Studio required.
As you may already know, vcheck requires the ver2001.all file to work correctly. It will download a fresh copy if the current local copy is out of date or not present at all. It appears that the new version of ver2001.all was overwritten by the older one on our FTP server. This caused vcheck to repeatedly attempt to access a now defunct URL when downloading a zip file.
The new ver2001.all is now back on the server and all should work as intended. My only defense is pointing out the admin post at the top of this board.
Thanks for reporting the problem.