We manually uploaded attack signature on device and started installed but from last 2 days installation still it is showing in-progress not getting complete.
As Samir mentioned, the installation process might have been stuck. you can check the below article:
@Lead - did @Samir's advice or the article @Mohamed_Salah_ shared help you? If yes, make sure to click the Accept as Solution button on the post that solved your issue - and if not, please let us know so we can help troubleshoot.