it takes one hour to write your own and be in full control...
httprequest to get a text/ini file with the version information (and anything else you want, like mandatory/optional, message for customers, announcements, ads for extra modules for the software, etc) and the download url for the installer
check version: if newer, httrequest to download the installer, shellexecute of it and endprogram...
And if you don't wan't hte user to need admin rights, download a wdl or a component instead and replace your original that was in the data directory...