How did you correct the error 500 on biolinks please? Have stuck with the problem for long now.Unfortunately, I do not use this author's script and check for 66biolinks before publishing. If you get error 500 when logging into the affiliate program in the Admin panel, check the log file in the root folder. Or maybe you have a poorly made null script and the license key does not work correctly. Earlier I had a similar situation in 66biolinks, I could not open statistics in the Admin panel and discount coupons did not work. Try to check and write to the script branch to the authors who makes null to check the activation key.