The new Lindell versions can't open presets that were created with the old versions, but there is a way to have the old and new versions together on your computer.
First, you need to reinstall the old versions. Here are the links to those:
Then, you need to change the filenames of your plugins. Go to the finder, click on the "Go" menu, and click on "Go to folder..." and enter this file path:
This will open a folder with all your aax plugins. Find all the Lindell plugins and add the word "old" to their filename. For example, change "Lindell ChannelX.aaxplugin" to "OldLindell ChannelX.aaxplugin"
If you plan to also use other plugin formats (for example, au or vst) you can do the same in these folders:
Once you've added "old" to all the filenames, you can reinstall all the new versions from our website. Then you will have the option to use the "old" named plugins when you need to use settings from your previous sessions.
I hope this helps.