Upgrade from CE to PRO

Hello, our company has bought license for PRO-server. Now we have CE version 7.1.8. Can someone describe upgrade process for me, please? Because official documentation doesn`t help, and does not upgrade to PRO version

https://manual.seafile.com/deploy_pro/migrate_from_seafile_community_server/

This manual does not works for full. After upgrade I can`t see PRO edidtion fucntions, also I can see logs in menu, but when I choose it, window says “Permission denied”.

did you try to delete the cache:
1 stop seafile server
2 delete the pycache folder in the conf folder
3 start seafile server

Yes, after this try I also have this error.

After restart I have en error "Page unavailable
Sorry, but the requested page is unavailable due to a server hiccup.

Our engineers have been notified, so check back later."

you are using debian, ubuntu or centos?
have you installed the necessary dependencies?
https://manual.seafile.com/deploy_pro/download_and_setup_seafile_professional_server/

Thanks to you, but we have used full clean installation