Yep, seems to be false alert. Trainer was crashing during the local coop. Rebooted + set to run as an admin by default + placed to AVG ignored folder = problem gone. Not sure what caused it, faced no problems before the latest game update.
Done the above. Installed the NET 3.5 also NET browser 4.0. Still have problem getting the trainer to work.
2 pop up saying:
1st pop up: This trainer must be authenticated before it can used. Please connect this computer to the Internet or obtain an offline key from cheathappens.com then re-run the trainer.
2nd pop up: This file does not have a program associated with it for performing this action. Please install a program or, if one is already installed, create an association in the Default Programs control panel.
My internet is alive and never experienced such issues with other CH trainers. Appreciate help please. Many thanks.