Yepp, that did it! I had a feeling this was related to my default character set beeing utf8mb4. Like this Plugin. Thank you for your help!
I disabled and even uninstalled the whole plugin at least 10 times. Each and every time I deleted the prli_db_version row from the wp_options table before reinstalling it.
Always the same result. Error creating the tables in the log files is:
Index column size too large. The maximum column size is 767 bytes.
Could you by any chance send the SQL I would need to run in order to create tables manually?
Thank you for your help.
Fred