Fortunately for us, JDownloader is a Java program so we can just download the “.jar” version and run it without installing. Some Anti-Virus software also flags JDownloader itself as being a “potentially unwanted program”. For a few years now, that official installer has contained adware and is sometimes flagged by Anti-Virus software for this reason. If you download JDownloader from a dubious source then, of course, you risk your computer becoming infected with a virus. You need to be very careful about where you download the software from. The good news is that JDownloader is safe to use, however, there are a few caveats that I must point out. I searched around the Web and posted on datahoarder forums asking if JDownloader was dangerous and I got a mixed response, so decided I would investigate for myself. In fact, this is exactly what happened to me and it made me worry that the software could be harmful to my computer. If you’ve ever tried to download or install JDownloader (aka JDownloader2), you may have been surprised to find that either the download was blocked by your Web browser, or that the installation file was quarantined by your Anti-Virus software.

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