There is a new beta version available that works with Dropbox version 2.10.29 again 🙂

Please check out the user group for more information, the download link, and to report any issues: https://groups.google.com/forum/#!forum/dropboxportableahk

Dropbox started to update old versions more aggressively and now blocks all old versions during the setup:

I am working on a solution to support the latest available Dropbox version and will post a new public beta version as soon as I am done 🙂