Prepros 7 is a major update so it can not be installed automatically. Please visit https://prepros.io to download and install the update.

7.2.15
March 29, 2020
added
Upload notifications.
added
Added a tooltip showing the actual compile time in compile log.
added
Added an option to allow self signed certificates while uploading files with FTP.
improved
Shift+click a folder to select all files.
improved
You can now add just the theme folder to Prepros while developing WordPress themes.
updated
Updated @babel/core to 7.9.0
updated
Updated @babel/plugin-proposal-optional-chaining to 7.9.0
updated
Updated @babel/preset-env to 7.9.0
updated
Updated @babel/preset-flow to 7.9.0
updated
Updated @babel/preset-react to 7.9.4
updated
Updated Autoprefixer to 9.7.5
updated
Updated Marked to 0.8.2
updated
Updated Dart Sass to 1.26.3
updated
Updated Terser to 4.6.7
updated
Updated Webpack to 4.42.1
7.2.14
March 4, 2020
updated
Updated @babel/core to 7.8.6
updated
Updated @babel/preset-env to 7.8.6
updated
Updated CoffeeScript to 2.5.1
updated
Updated Less to 3.11.1
updated
Updated Dart Sass to 1.26.2
updated
Updated Terser to 4.6.6
updated
Updated TypeScript to 3.8.3
updated
Updated Webpack to 4.42.0
improved
PHP, HTML, CSS and JS files can now be imported from Pug files.
7.2.9
January 24, 2020
fixed
Fixed an issue preventing Prepros from running local node modules while using custom tools.
7.2.8
January 18, 2020
updated
Updated Dart Sass to 1.24.5
updated
Updated Node Sass to 4.13.1
updated
Updated Terser to 4.6.3
updated
Updated Autoprefixer to 9.7.4
updated
Updated Babel and Babel Plugins to 7.8.3
updated
Updated TypeScript to 3.7.5
improved
Added an option to append output suffix even when the output file doesn't overwrite the input file.
fixed
Minor bug fixes.
7.2.0
January 10, 2020
added
HTTPS Preview Server
added
Bundle JavaScript files with Webpack.
added
Install, update and manage packages with NPM.
added
Brand new Remote Inspector.
added
Dart-Sass compiler.
added
SVG Optimization.
added
You can now add your own tools to process files.
added
Minify ES6+ code with Terser.
added
Open project in your favorite code editor from context menu.
improved
Brand new UI.
improved
You can now adjust quality while optimizing images.
improved
Project list and file options sidebar are now resizable.
improved
Pug files can now be compiled to .php or any other extension.
improved
Automatic reload and browser synchronization can now be toggled quickly.

There are a lot of new things, bug fixes and performance improvements under the hood. 3,596 commits to be exact. I hope you you like the update :)