I just downloaded the trial 3.9 version. Here are the issues:
1. There is no indication that the update nor the import process completed. The status just says "Plugin is running. 5 of 79 has imported." and stay like that. The way I check if the import or update is completed is by downloading the log-file.
2. Importing the tiered prices is not working. I tried both normal and simple. At one point the tool deleted all the tiered prices but did not replace the values from the CSV file.
Looking forward on the response, so I can purchase the full version.
Thanks,
Michael