Do you provide a “download latest” link (rather than links to specific versions) for totalfinder and totalspaces2?
I’d like to automate the installation. 
We can definitely figure something out.
Right now we have our feeds for sparkle updater, you can get latest download urls and checksums from there:
http://updates.binaryage.com/totalfinder.xml
http://updates.binaryage.com/totalfinder-beta.xml
http://updates.binaryage.com/totalspaces2.xml
http://updates.binaryage.com/totalspaces2-beta.xml
We could provide a more convenient API for that by running small heroku app which will fetch these and provide latest URLs. Is simple HTTP GET returning the url good enough? Or should we setup some 304 redirect for a link which will always redirect to latest version? Let us know how would you like to consume it.