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If the images are in a different location then you'll have to tell LR where they are. But Collections will remain intact and there once LR knows where the images are.
Grayed out and zero count on a folder usually means there have been photos in Lightroom and in the folder but there aren't now. Are there photos in those folders shown in Explorer and have they been in LR?
Another cause of gray folders is if the drive with the folder on is off-line...
Correct, LR organizes the way it wants to (but be sure to back them all up!)
What sort of presets are you not finding? If you open Develop, then Presets in the left hand pane, find one you can't find in the locations mentioned, then right-click one option is to show in Finder / Explorer - this...
The ones stored next to the catalog are where at some point (perhaps now still) you ticked to store presets with the catalog. If that's ticked then it copies them to that location (and uses them for the catalog that it's ticked against)
The other two locations are correct - main one is...
Collections are basically a series of links to various photos and are held in the catalog so yes. But not the photos in the collection (or any in face in Lightroom), they have to be backed up separately. I appreciate you probably know that but include the comment for the benefit of others...
The Adobe Cloud isn't designed or intended as a backup system for photos for Classic, it's tied to the cloud version which is used by many instead of Classic (so local storage not needed as all photos are in the cloud, usually with a 1Tb store)
You can indeed sync to Classic via the cloud...
Downloads for LR5 and earlier are no longer available from Adobe (saves looking there)
If you manage to get the media, then as long as you have the license key (or registered it with Adobe) you can install on a fresh PC.
Hi and welcome to the Forums!
It sounds like you're on an older version of Classic (and if your '2015.14' is correct then that is an old version)
To be sure, can you check for us?
Are you actually on a subscription version...
Here's a link to the help document on the Forums to take screenshots (that will help us - perhaps also a screenshot from the folder in Explorer / Finder showing the files(s) and type too)
First, welcome! Second, don't delete anything!!!
Can you show us a screenshot please? When you say it shows zero, do you mean in the folder panel on the left? Try setting Library - Show Photos in Subfolders if it is?
Did you actually install LR6 or copy from the previous computer?
I would suggest it needs to be installed by downloading LR6 from Adobe here then registering it with the original License key (if you don't have the key, then as long as you registered it initially Adobe Support will assist)
Welcome to the forums, Pathy!
If it works for you, then that's good. You do lose some things doing it your way, some of which probably don't matter to you if the workflow works for oyu. For example, Collections, Stacking. The one thing that would bother me is losing the History, but again, if...
You should fine the blog below helpful. Aim to update the folder location at the highest point possible (then all the folders under are sorted at the same time):