Cannot see 4Duino via "Boards Manager"

Development Tools IDE 1.x
3

ashasingh18:
Hi,
Since yesterday afternoon (5/9/2018) I have not been able to compile my projects that is using 4Duino since last past this January. I have ARDUINO 1.8.5 IDE installed and I tried to update the boards to 4Duino but it does not get to http://www.4dsystems.com.au/downloads/4duino/package_4dsystems_index.json

Because I get error

http://www.4dsystems.com.au/downloads/4duino/package_4dsystems_index.json file signature verification failed. File ignored.

Please help as we are stuck and we are in time crunch.
Thanks,
Asha

Hi, Asha. It happens the same issue with my Arduino. Have you found a solution. I tried a manual installation as Pert says. Now I can select 4Duino board in Arduino, but when I run Workshop software it says there is a problem to compile sketch. I have posted a message at 4DSystems forum. Let's see if they answer.
https://forum.4dsystems.com.au/forum/forum-aa/4d-systems-software/workshop-4-software-ide/63410-arduino-error-with-4dsystems-boards