New Mac , I can't get Lightroom 6 to open so I can transfer everything to my new LR cc .

[#1]

If you have Mac OS Catalina, then you cannot install Lightroom Version 6.

If you subscribe to the Photography Plan that includes Lightroom-CLASSIC (v9.4) then your Catalog from v6 will update and open in Lr-Classic, and you carry on as before. You would need your Catalog and all Photos copied to the new Mac.

Move Lightroom to a new computer? | The Lightroom Queen 

If you only subscribe to Lightroom (the Cloud based v3.4) you will not be able to open your LR6 catalogs. But a work-around is to Install Lr-Classic (as a 7-day trial), upgrade your v6 Catalogs, then 'Migrate' your files to the Cloud ecosystem.

So the questions are-

What is your new Mac OS version number?

Do you subscribe to a Photography Plan?

Which Plan?

Do you want all your photos 'migrated' up to Cloud storage?

Or do you want to keep all your files 'local' on your hard-drive?

[#2]

If you have Mac OS Catalina, then you cannot install Lightroom Version 6.

If you subscribe to the Photography Plan that includes Lightroom-CLASSIC (v9.4) then your Catalog from v6 will update and open in Lr-Classic, and you carry on as before. You would need your Catalog and all Photos copied to the new Mac.

Move Lightroom to a new computer? | The Lightroom Queen 

If you only subscribe to Lightroom (the Cloud based v3.4) you will not be able to open your LR6 catalogs. But a work-around is to Install Lr-Classic (as a 7-day trial), upgrade your v6 Catalogs, then 'Migrate' your files to the Cloud ecosystem.

So the questions are-

What is your new Mac OS version number?

Do you subscribe to a Photography Plan?

Which Plan?

Do you want all your photos 'migrated' up to Cloud storage?

Or do you want to keep all your files 'local' on your hard-drive?

[#3]

Thanks.
I now know I need to go with LR Classic and will switch plans.