AHHH!!! Nope, this won't work with this version - only the previous one (you find it.). the script urie provided (in the link) needs corrected to change the occurrences of '6.80' to '6.81'. You are repeatedly asking for something that has been already provided and just give an alternative/harder way. In addition, urie just told you you MUST DOWNLOAD THE AUTOIT PACKAGE (a software that MUST be installed), install it, compile the given script, and VOILA! Please don't ask - I haven't used it but it's definitely created with it. If you're really daring you could 'repack' the NSIS Installer (see this).

Of course if you look inside the 'install_script.iss' file you'll find a number of Registry entries that are NOT installed (File Associations, etc). I downloaded it and that appears how it works (did via the Official site, btw - and it is the same as your link which is unnecessary). You COULD just 'extract' it using UniExtract and 'create' your own 'installer' (by whatever method). I didn't get ANY of the 'symptoms' you mentioned when I did it that way. Your 'problem' is the Conduit program that's embedded in the Installer.

It APPEARS to be an Inno Setup which DOES extract using UniExtract (search for it using google or her on MSFN) and running the main program APPEARS to make it 'stand-alone'.

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