Collabora Office 6.4-45, the second

My configuration:
Ubuntu 18.04 4.15.0-151-generic
PHP 7.4.21
mysql 5.7.34
Apache/2.4.29 built: 2021-06-18T11:06:22
Nextcloud 20.0.11
Collabora:
LOOLWSD
6.4.10
LOKit
Collabora Office 6.4-45

After the last Collabora update (to version 6.4.10.45-45, 2021-07-20) I can’t load any LibreOffice documents.
So does anyone know how to go back to the version before?