You can download Safari Beta for Catalina here:
https://download.developer.apple.com/Safari/Safari_14.1.2_for_macOS_Catalina_beta_2_and_Safari_14.1.2_for_macOS_Mojave_beta_2/Safari_14.1.2_for_macOS_Catalina_Beta_2.dmg
it works for me !
Nicolas_Chevallier
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