The install_CP.txt file is the installation instructions for the module. Follow what it says.
You'll also note that it does NOT tell you to upload the lettermail_readme.txt file, nor the mysql_canpost_dimensional_13x.sql file, nor the install_cp.txt file. So, you won't upload those.
Plus, I'm not sure why you keep typing incomplete filenames. The file isn't named "mysql_canpos". It's "mysql_canpost_dimension_13x.sql". If you've unzipped the files and their filenames are incomplete, then you won't be able to use the addon properly. Fix that problem first, by making sure your unzip program is capable of unzipping files with long filenames (all reliable modern unzip tools can do this just fine).
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