Make sure you put your Project file backups in a safe place just in case.
Uninstall the current version.
https://nicepage.com/User/app/downloads
Install the version you want to use.
Just remember, if you updated your site with a newer version, it might not open in an older version since changes were made.
Hello,
Thanks for your interest in Nicepage!
Could you please describe in more detail what exact troubles you experience?
...................................................
Sincerely,
Negat Veri
Nicepage Support Team
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