Hi,
May not be right solution but working fine though 
Thought of many workaround but not 100% efficient.
How about keeping an eye on progress bar 
- Go to download (ctl+j)
- check whether download started or not (image exist on progress bar)
- once started then look for progress bar to vanish (Wait Image Vanish)
Browser: Chrome
sonaliaggarwal47
A_Learner
sharazkm32