Hello, I was installed pmdg 747, and now i install pmdg 737NG with 800-900, and now when I want to take a 747 I get error with Dont send..... and checkbox with restart fs9. But 737 works good. So what is wrong, and maybe I need reinstall 747?

You need to install the 737 and all updates patches before you install the 747

>You need to install the 737 and all updates patches before>you install the 747... or at least back up the PMDGOptions.DLL in the Modules directory before you install the 737 and then overwrite the 'new' ( old really ) version with the backup when you're done installing.

thx guys, I reinstall 747