The site is heavy on intrusive ads, pop-ups, and redirects, which can sometimes lead to suspicious "software updater" prompts.
Instead of shady web bypassers, use a dedicated local download manager. These do not give you free premium speeds, but they allow you to pause and resume broken downloads and organize your files safely. JDownloader 2:
If you encounter an error stating your IP address is already downloading a file, clearing your cookies or cycling your internet router (to get a new dynamic IP) can sometimes reset the download timer.