Err non issue. If both Server and client require the Hotfix. If the server is running the Hotfix and CRT=2 and the client doesn't have the Hotfix he will be kicked. i.e CRT=2 has detected different DT.DLL therefore says sorry your install is different. ... This has been verfied.

So CRT=2 works with the Hotfix !

Hmmmm... put the hotfix in and no cdt, not that I really had any before (thanks by the way!). Anyway not sure if it's related to the hotfix or not but I first noticed it after the fix:
My quick mission builder won't work now. Does the same thing it did back with 4.10, when I click the button I get the splash screen and nothing else. Have to close it out with task manager. Any ideas?

Try to delete .last.quick file in your Quicks folder.
The file might be hidden by default in Windows.

Try deleting your last Quick mission. (location: ..Il2game root../Quicks/.last.quick)

Damn! Second again... I need another horse. :D

Help, the problem remain:
This almost always happen during combat. The screen froze for like half an second, and sometime later it happen again and again. The time interval of the froze screen is getting smaller and smaller untill it can't move at all and then this message shows up:

Microsoft Visual C++ Runtime Library

This application has requested the Runtime to terminate it in an unsual way.
Please contact the application's support team for more information.

please help

can't seem to download from megauplode is their another link for the hot-fix

That was quick!!!!

Ta!

For a start try to re-apply hotfix DT.dll after you reboot your PC.
Play mission which gives you the problem.
If error happens again look for a file with name similar to this:
hs_err_pid912.log
in your Il2 directory, if it is there, post it here and upload the mission somewhere for us to test it.