1. Go to your server/cPanel/hosting application location
2. Remove "vendor" folder
3. Go to the "bootstrap" folder> inside found cache> remove all files inside the cache folder
4. Go to admin dashboard > About and update> upload "03_InfixLMS update v8.0.0.zip" and do update 
5. Done


Check video how to one click update
https://www.youtube.com/watch?v=3NEY3DI84yA