The error you are getting doesn’t appear to come from the master_2019.2 load. I believe that you loaded the master version which isn’t supported. Use this link to get the master_2019.2 version: Master 2019.2 Zip File.
You should restore your database and clear out all file from the previous download. Be sure to keep your config/config.php and config/custom.config.php files from before the previous load.