So I'm running OS X 10.5.8 on my PowerPC iMac G5. (It's all I can afford; I'm on disability and am brutally poor. Can't-afford-TV-service poor, I'm talking.) And I've been enjoying downloading videos from YouTube via SaveVid.com. Been doing for over a month, no problems. Until yesterday. All of a sudden, nothing is working, I'm constantly hanging on "loading", and when it does resolve, it tells me that I need to install Java. Which is kind of strange, given that I have Java installed and enabled, and I was getting the Java permission pop-up every time I went to the site, but whatever. I clicked on "Software Update", as I'd been told to do, and nothing. SU informed me that I was all up to date. And yet, same problem, over and over. Annoyed, I searched the web for solutions. One page told me to toss my Java cache. Did that, no change. I'd love to upgrade to Java 7, of course, but I'd need to upgrade my OS, which I can't do until I upgrade my machine, which I can't do. So I'm stuck with Java 6. Or am I? Finding this page at Gephi.org (https://gephi.org/users/install-java-6-mac-os-x-leopard/), I learned that while Java 6 may be installed, you need to activate it manually. (Again, why this should be an issue when it wasn't on Tuesday, I haven't a clue, but whatever.) So I go to my "Java Preferences" control panel to move Java 6 to the top of the list and it isn't even there! All that is showing is J2SE 5 and J2SE 1.4.2. And then I ran the "java ~version" Terminal command (as recommended) to see which version was being run and I got the message: Exception in thread "main" java.lang.NoClassDefFoundError: ~version Which seems to be an error that compilers get, except that I wasn't trying to compile anything. I did discover that I apparently trashed a "Java" folder with a "main" subfolder by mistake, so perhaps that's what the Terminal is looking for. I'd restore that folder if I could recall where I removed it from. (Senility sucks.) I thought perhaps it might be better to just download v.6 and start all over again, so I went to the page (http://support.apple.com/kb/DL1359) with the last update for 10.5 on it at Apple and clicked for the download. And got 404'd. No luck there. So now I have no damn idea what to do. Oh, and in what I think was a completely separate but annoyingly synchronous failure, all of a sudden I can't even SEE the damn YouTube vids, as they're now telling me I don't have Flash installed. Again, just as with Java, my older machine prevents me from running the latest version (or anything resembling the latest version), but I do have Flash. (As I said before, above, it was working fine on Tuesday.) This is extremely frustrating and my mental health is not so good to begin with. Any and all solutions would be deeply appreciated. Thanks in advance.