How can I delete TotalSpaces 1?

without damaging or affecting TotalSpaces 2.0

Just drag TotalSpaces to the trash from your Applications folder.

The ScriptingAdditions are overwritten by TotalSpaces2, so nothing needs to be done there.

To be super-clean you could also remove the tiny prefs file if you wish - it lives at ~/Library/Preferences/com.binaryage.TotalSpaces.plist