ChemDraw: Error while activating ChemDraw/ChemOffice: Generic communication error, “Error talking to server... Generic communications error” or "HTTP error"

I get the below error while activating ChemDraw/ChemOffice: Generic communication error, “Error talking to server..... Generic communications error” or "HTTP error"

A firewall or proxy server in your Internet connection seems to be blocking the connection with the activation server. If that’s the case, the best option for you is to use the “Activate by uploading a file option” by following these steps:

1. Select the "Activate or deactivate by uploading a file" option and click on the "Activate" button. You will be prompted to save a local .BIN file to some location you choose (e.g., your Desktop). Then close the Activation Dialog. Continue installing the software to completion, if you haven't done so already.

2. Navigate to the following website: https://revvitysignals.flexnetoperations.com/ and log in. If you have never logged in, create an account using your organization’s email address.  Once logged in, select " List entitlements>Download Now>Offline Device
Management ".

3. Click the "Choose file" or "Browse" option (depending on your browser), navigate to your .BIN file and then select "Open". Then select "Send" to upload this .BIN file.

4. The response file will be downloaded to your Downloads folder.

5. Rename the file received to “Response.bin”.

6. for Windows, the “Response.BIN” file should be placed in the "C:\ProgramData\PerkinElmerInformatics\FNE" for version ChemDraw 22 and “C:\ProgramData\RevvitySignalsSoftware\FNE” for version ChemDraw 23 and newer.

For Mac or for older versions (for example for v21) use the folder with the version number instead:

C:\ProgramData\PerkinElmerInformatics\FNE\21.0 (for Windows) or
/Users/Shared/com.perkinelmer.chemdraw.21/FNE (for Mac) 

For Mac and ChemDraw version 23 and newer use, /Users/Shared/com.revvity.chemdraw/FNE.

7. Then relaunch the software by right-clicking on the ChemDraw icon and selecting "Run as an Administrator".  The activation should take place automatically.  

Note: The bin files used in this process are specific to the computer where they are generated. If you need to activate multiple computers using this method you will need to generate and upload one file each for each computer.