Install Server Side Certificate on Linux Web App

My Linux based web application is currently down due to a revoked server side certificate. I need an expert who can quickly download and install a free server side certificate to get my application back online. The server runs Apache. This task should be straightforward and swift. Further details will be provided once we agree on the terms.

Ideal Skills and Experience:
- Expertise in Linux and Apache
- Proven experience in server-side certificate installation
- Quick problem-solving skills
- Ability to work under pressure
- In-depth knowledge of SSL/TLS protocols

Please use Let's Encrypt for the certificate.