I've been using JDownloader for years now, and I can confidently say it's safe as long as you download it from the official site. The ads can be annoying, but they're not harmful. Just make sure to uncheck any optional software during installation. I pair it with Windows Defender, and it's been smooth sailing.
If you're worried, you could try alternatives like Internet Download Manager (IDM) or Free Download Manager (FDM). They're also great tools for downloading.
If you're worried, you could try alternatives like Internet Download Manager (IDM) or Free Download Manager (FDM). They're also great tools for downloading.