Did everything as per instructions:
1) replaced the CommandBar.htm file in the ui folder
2) extracted customui folder to ui folder

I run the program, an error appears.

After clicking ok, the program starts, but the buttons do not appear.

Hi artyomlekos, that's an error that will appear if you're using an old version of MoI. Make sure you're running either the final v3 release, or the current v4 beta.

You can get the final v3 release by putting in your license key at http://moi3d.com/reinstall.htm or the v4 beta at http://moi3d.com/beta.htm .

- Michael