Hello @Bahadır AÇIKTEPE,
Welcome to Microsoft Q&A forum.
See if you can download Visual Studio 2017 by using the links shared in this thread: Cannot download Visual Studio 2017.
Update1:
Besides, as Visual Studio 2015 doesn't provide web installer, only ISO/DVD version of VS 2015 is available. If you want Visual Studio 2015, you can check this thread: Error on Visual Studio 2015 installation.
Kind Regards,
Tianyu
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