1. Connect to the ESXi host with an SSH session and root credentials.
2. Run this command to verify the symbolic link:
   
   ls -la /usr/lib/vmware/isoimages/
   
   You see output similar to:
   
   ls: /usr/lib/vmware/isoimages/: No such file or directory
    
3. Run these commands to remove the invalid link:
   
   cd /
   
   mv locker /tmp
    
4. Run this command to find the datastore that contains the locker:
   
   find . -iname vmtools
   
   Example: find / -iname vmtools
   
   /vmfs/volumes/5643b20b-d47f08bb-8b7e-a0369f7b334c/packages/6.0.0/vmtools
   
   /vmfs/volumes/5643b20b-d47f08bb-8b7e-a0369f7b334c/packages/6.0.0/
    
5. In the vSphere Client\vSphere Web Client, navigate to ESXi host > Configuration > Advanced Settings > UserVars.
6. Enter the /vmfs/volumes/datastore/packages/esxi_version/ in UserVars.ProductLockerLocation and press OK.
7. Reboot the ESXi host to update the new value of UserVars.ProductLockerLocation or put the host in maintenance mode . For ESXi 6.5 or later, see note section.
8. Perform below steps to manually set up /productLocker symlink by removing /productLocker link and recreating /productLocker 

              a. Run this command to put the host in maintenance mode:
                          # esxcli system maintenanceMode set --enable true

              b. rm /productLocker
  
              c. ln -s /vmfs/volumes/<volumeName>/<extracted directory> /productLocker
 

            Example:   5.5 /locker/packages/5.5.0/ 
                               6.0 /locker/packages/6.0.0/ 
                               6.5 /locker/packages/6.5.0/ 
                               6.7 /locker/packages/vmtoolsRepo/
                               7.0 /locker/packages/vmtoolsRepo/

              D. reconfirm the symlink Run this command
                           #find / -iname vmtools 
          
      E. To exit the host from maintenance mode:
                      #esxcli system maintenanceMode set --enable false


Note: If the host is running with ESXi 6.5 up to the version before 6.5U1, not putting the host in maintenance mode may lead to VM crashes due to the host security policy when VMs try to access the new /productLocker link.

ESXi 6.5 Update 1 provides a tool 'updateProductLockerPolicy' to avoid the need for putting host in maintenance mode. It can be used as in the steps below:

a. Run this command to get existing /productLocker symlink target known to ESXi kernel:

secpolicytools -d | grep $(basename $(readlink /productLocker)) | cut -d' ' -f2 | head -n 1

b. rm /productLocker

c. ln -s /vmfs/volumes/<volumeName>/<extracted directory> /productLocker

d. updateProductLockerPolicy <old-symlink-target-from-command-above> /vmfs/volumes/<volumeName>/<extracted directory>