The "unsupported protocol" error when it tries to download Java should now be fixed. I changed to a different Inno Setup plugin to do the download, the old one didn't support HTTPS which the Java download link has started using. The new version 5.3.20 should auto-download Java properly, alternatively you can install Java yourself from java.com and the DVA installer will detect it and not attempt to install it for you.
If it's hanging/crashing on startup, it's possible the serialization format has changed between Java versions and the application's cache is either unusable or corrupted. Try deleting this folder: "c:/Users/your username/AppData/Local/Temp/dvatmp"
If it still doesn't work, uninstall/reinstall it fully, also including the above step.
- Uninstall it
- Delete folder "c:/Program Files/DVA" if it exists
- Delete folder "c:/Users/your username/AppData/Local/Temp/dvatmp"
After that, it should work.
Also, if you encounter any hang/crash it would help if you can run it in the command prompt and copy/paste the logging output in a PM.