The icons for downloading versions of Minecraft Java do not appear in the launcher in the "installations" section. which

When I open the Minecraft launcher and select Minecraft java, it does not allow me to select any version, so I check the "installations" section and I notice that the buttons necessary to search for and install new versions have disappeared,I try to fix this problem by uninstalling and reinstalling the launcher and Minecraft java, I restart my computer and it doesn't work, when I try to start I get a message.