When you see the prompt "Datei herunterladen" (Download file), ensure you are sourcing the file from a reputable platform like BlenderMarket or Gumroad to avoid security risks.
: Locate the downloaded .zip file and click "Install Add-on." Datei herunterladen blender_turbo_boost_v_3_0_0...
: Save the .zip file (blender_turbo_boost_v_3_0_0) to your computer. Do not unzip the file. Open Blender : Navigate to Edit > Preferences . Add-ons : Click the "Add-ons" tab on the left. When you see the prompt "Datei herunterladen" (Download