Windows Defender is currently giving a warning about the Pivot Animator installer as a virus. This is a false positive and we're doing all we can to get it resolved as soon as possible. The installer does include advertising but all offers are optional and safe.
In the meantime you can follow the instructions below to add the installer to your allow list, after which you should be able to download again successfully. If you're unsure about this then please note that 69 out of 71 antivirus engines are currently flagging the installer as clean, which could not happen if it contained a virus. If you are still concerned about this then please use the contact page for further assistance.