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BACKUP / DUMP databases all. DEINSTALL and new install older version with after that restore Databases.
All thing of virtualmin webmin postfix and co i don't know, so please is only then normal way / advice.
TAKE CARE OF WORKING BACKUPS and RESTORE possibylities.
CHECK working backup before unstall that they are working and complete!
IF EMPTY / none not important own and custommer databases take care of backup parts for virtualmin / webmin i guess.
POSTINSTALL option in virtualmin / webmin should take care of some i hope after dowgrade