I can use Lightroom 5.7 alright, but I cannot import any photos since I installed El Capitan, OS version 10.11.3 on my Apple computer. How can you help me please? How can I get an update to my one-time purchase Lightroom? I am not using Lightroom CC
El Capitan has changed the permissions of the folder you have selected as the Destination in the LR import window. Either change the Destination or set the proper permissions on the drive/folder you have selected.
If you have selected an External drive as the destination then it could also be that external drive is formatted in the Windows NTFS format and El Capitan removed the utility you had installed so OS X could write to drives formatted in the Windows NTFS format. OS X can Read NTFS formatted drive but it can not natively write to them.