Are you able to help me sort this, please. I thought I'd been careful in deciding which version. The summary of your software probably seems very straightforward to you but my logic took me to vers 7. If MSFS had 2020 after it I might have thought twice, but saw it as a new all singing all dancing version that was backward compatible. I was looking for 64bit as my machine is that, so I didn't use vers 4 because of the 32bit label. I am a pilot not a software guy, so, sorry, I got it wrong. I don't suppose the key will work with version 4. Are you able to cancel the key I have and replace it? Again, sorry, my mistake. You may wonder why I'm not using 2020 but FSX is good enough for IR flying and tweaking the settings is even more important for the flying I want to do. Hope you can help.