Hi, same version for me, but fixed.
Workaround:
1. You need go to Extensions, disable auto-update.
2. Download Lets Encrypt 2.9.0 (Let's Encrypt - Plesk Extensions)
3. Then, remove SSL It! and Lets Encrypt 3.0 (or by plesk bin extension -u sslit && plesk bin extension -u letsencrypt )
4. Upload...