Depends on the operating system you're running on. However, if the blocks have been removed in GNU Radio 3.8, they've been removed because they didn't work anymore, so you'll need to replace them either way.
Best regards, Marcus PS: If you include as much info as possible in your original emails, it's easier to help you right away. On Wed, 2020-03-04 at 16:26 +0300, Ahmet DEMIR wrote: > Hello, > Thank you in advance for the help... > I am trying to transmit a video wirelessly by using Gnuradio. However, some > of the blocks that I want to use in my study are undefined. But, these blocks > can be reached at older versions of Gnuradio. I followed the instructions > given below web-site. But, I get some errors. I also give the error > screenshot in below figure. Can you help me how to install gnuradio 3.7 > version instead of 3.8 version? > Thank you. > Web-site: > https://wiki.gnuradio.org/index.php/InstallingGR#To_install_system_wide >
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