LrC-Transition from Adobe Creative Cloud Sync process engine v 1 to process engine v 2.

Question

The subject process took place in LrC 13, it commenced in v 13.2 and completed in v 13.3.
As a result of this transition if users wish to sync images to Adobe Creative Cloud to Lightroom ecosystem (Cloud-based) they are required to use LrC v 13.3 or later.
If users wish to upgrade from a LrC version earlier than 13.2 (including Lr 6 original version) directly to  the latest version 14 they will get an errror that indicates their catalog cannot be upgraded. They will need to use LrC 13.2 to upgrade their Catalog then use LrC 14 to upgrade the Catalog to v 14.
During the past few months there have been many threads related to this issue.
I am suggesting a pinned thread along these lines, amendments or corrections welcomed.

DdeGannes · Accepted Answer

@Rob_Cullen , thanks for that info, I am not able to test this on my system as I do not have any Lr 6.14 Catalogs.The issue raised in this thread is now mute. Further discussion is not necessary.

Rob_Cullen · Answer

@DdeGannes Hi, I saw a post from Rikk Flohr who says this problem has been fixed in LrC Version 14.2

It should not be neccessary to go back to v13 to upgrade a v6 (Legacy) catalog.

https://community.adobe.com/t5/lightroom-classic-discussions/problem-when-trying-to-open-lr6-catalog-in-lrc/m-p/15233637#M400260

The upgrade v6 > v14.2 will throw up an error message but the message relates to Masking data (Missing the .LRCAT-DATA file) which of course did not exist in V6.

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