You can find exactly the same code and data at: https://github.com/hannahmetzler/CovidEmotionsTwitter/ (on the master branch)
If you prefer downloading data and scripts from the OSF:
Download and extract the files data.zip and analysis_folders.zip.
Place all content from these .zip files (folders and .Rmd files) into the same project folder, from which you want to run R.
Now use the different .Rmd file in the numbered order within RStudio to run all analysis and produce the PDF reports with results yourself.