Were you able to download and access the actual platform itself without the charting package? Or was this message prohibiting you from accessing the entire platform?
If you are able to access GAIN Trader without charts, you should be able to download the charting package directly from the following link: https://gainfutures.com/gain-trader/download. Scroll down to the LIST OF OEC TRADER PLUG-INS table and select the appropriate download under the: Chart/Custom Indicator Package column.
If you were unable to download/access the actual platform itself, Gain suggested that you may have a firewall or antivirus software blocking the download. In this case, they have suggested disabling any active firewalls or antivirus until you complete the download of Gain Trader. Once you have everything downloaded, you can reenable them.
I would suggest trying the steps listed above, if you have further issues please let us know or give us a call.
Optimus Futures Support