UVNC-Helper is open source and the source of every version including betas will be available to download from http://teammc.cc/uvnc/more.

Getting AutoIt & Scite:
Visit http://autoitscript.com and navigate to the AutoIt3 download section. Scroll down to the first download items "AutoIt Full Installation" and "AutoIt Script Editor." download and install these, follow any directions provided by the installation packages.
Note: The script editor is needed to utilize all the compile directives.

Getting the source:
Visit http://teammc.cc/uvnc/more and choose the UVNC-Helper-SRC-*.zip file that you would like (most likely the one with the highest version number). Once downloaded, unzip it into a new folder.

Viewing Source/Making Adjustments:
Even if you just want to compile it "as is" you should consider making a couple adjustments (like enabling UPX to create a smaller executable file or chaning the Icon used for the executable). To do this, navigate to the new folder you unziped the source to.
As long as AutoIt3 is installed you should be able to right click on "UVNC-Helper.au3" and click on "edit script". Once the script editor has opened you should see at the top a list of compile options that starts the line with "#AutoIt3Wrapper_" these are the options you should be most interested in.
Just below these options you will see some notes titled "COMPILE NOTES:" read these before doing anything else, they contain information about changing specific compile options and what version of autoit was used.

Building:
After you have made adustments to the script simply goto the "Tools" menu at the top of the script editor and select the option "Build", depending on your system, it may take upto a minute to build.
After it has completed you should see "UVNC-Helper.exe" in the same folder "UVNC-Helper.au3" was in.

A Note About How I Compress My Builds:
In this order, i...
*Strip winvnc.exe of extra resources that we wont use in a SingleClick - The largest side effect of this is that we loose the digital signature
*Compress winvnc.exe using PECompact2 with lzma2 method set to highest compresion. - Anytime a executable is compacted it increases the chance of AV programs creating a false virus detection.
*Compile the autoit script (packs winvnc.exe within the script) with Obfuscator set to /StripOnly and upx off.
*Compress the compiled script using PECompact2 using same settings as above.