After installing CometBird is not getting started

I was using cometbird 3.6.16. Then I downloaded version 11.0 for windows, uninstalled 3.6.16, and installed 11.0, but when I tried to start the browser the following dialogue box showed up:

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I suggest you try reinstalling, it looks like something failed to install.

Also, don’t save screenshots as .bmp, they use no compression, save it as a .jpg, or .png file instead.

Re-installing didn’t fix the problem. Instead I installed version 9.0 and it seems to be good enough for me. Anyway, THNX!