The catalog was created by Lightroom 6/Lightroom CC
There is no way you can open this catalog in Lightoom 5. You need to have Lightroom 6/Lightroom CC to open this catalog.
Ok thanks - so.. is LR6 and LR CC the same thing?? Can you buy LR6 outright or is it a monthly subscription??
LR6 is the standalone version of the software. Pay one price, never pay a cent again to use it. Go to Products, scroll down to the bottom to LR6, click on Buy, change "Full" to "Upgrade"
LR CC is the Creative Cloud (subscription) version of the software, comes with Photoshop and Lightroom Mobile and a couple of extra features in LR.
ok great - thanks so much for the info.
If I select "upgrade" to LR6, will I still be able to open LR5 catalogues that clients send me that they've created in LR5? And I'll need to send them back LR5 catalogues that they can open in LR5 too....?
Yes, LR6 opens all versions of Lightroom catalogs.
No you cannot send them back LR5 catalogs from LR6. If you know your client is using LR5, you'd have to use your LR5 to create a LR5 catalog for them.
Ok - last question... if i "upgrade" will I have both LR5 and LR6? So can I open up either one and sometimes work in LR5 and sometimes in LR6? Or would I need to "buy" LR6 outright to keep both LR5 and also have LR6?
Thanks again for all of your help
If you purchase the upgrade to LR6 and install it, you now have working copies of both LR5 and LR6.
Then, you can open either one and work in the desired version.