ICQ closes on June 26th
You can download history from the server to Miranda by right-clicking on a contact and selecting the appropriate menu item.
Please note that this will only download files whose size does not exceed that specified in “Settings → Events → File transfers → Download cloud files automatically only if their size is less than X kilobytes”. If you want to download all files, set the setting to zero and clear the contact’s history, then download the history again.
You can also use the web version of ICQ and the ICQ Backup 2024 browser extension.