Try the following steps in order:
If you have recently tried to access and were met with a cryptic error message or a blank page containing the string "blkdln-ntb" , you are not alone. This issue has been reported by several users attempting to download software or access resources from Flowcode, a popular platform for microcontroller programming and electronic system design. flowcode.com page blkdln-ntb
Have you encountered this error on another site? The principles above (disabling VPN, changing networks, contacting support) apply broadly to most "blocked download" notifications. Try the following steps in order: If you