Long winded title. Sorry. Purchased BS years ago and recently purchased BS2 upgrade to that. Also have A-10C. All worked fine prior to DCS World. Now installed DCS World. A-10C module works perfectly. Attempt to install BS2 upgrade module and am instructed to install BS. It was uninstalled a long time ago. Cannot install BS even with fresh downloaded files from DCS website. Get the following error: Installer integrity check has failed. Common causes are incomplete download or damaged media. Never had that before with any other software. Repeatedly redownloaded the file but always the same error. Can't install BS and therefore can't install BS2 upgrade. Any suggestions? Searched the forums and did not find anything related. User support has acknowledged my trouble ticket but haven't heard back in over week. Not the end of the world by any means but I would like to get this working properly. Any suggestions would be greatly appreciated!