Moving LR and probably Affinity is more complex than just copying files from the old computer.

Regarding LR, and probably Affinity, you need to:

1. Assure you have the install files. If you don't / don't remember, go to the Adobe site and download the install file from there. You'll need an Adobe user name and password and the software serial number. If you've done this in the past, they'll be there today. Otherwise, open a support chat with Adobe and get this information and download the install file.

2. Use an external HD that you can share between the old and new computers. Copy the "Lightroom Catalog.LRCAT" file and all your existing image files onto the HD.

3. On the new computer, install the LR software and assure all the point-release maintenance updates are applied. Once the software is running but "empty" of any images, close LR and replace the LRCAT file with the file copied from the old computer. At the same time, copy all your old image files into the same position on the new computer.

4. Reopen LR again on the new computer and everything should be as it was on the old computer relative to LR.

4a. If you created any presets like Develop or Export, you need to find these files from the old computer that are located in your "user profile" folders. Use Edit / Preferences / Presets inside LR to find the presets location on the old computer. Copy those old files to the new computer.

Affinity photo is a standalone program although it also integrates well with affinity designer and affinity publisher and even shares some tools between them.

Affinity photo can also host a lot of photoshop plugins e.g nik collection and topaz.

Affinity photo does not do anything with 3d modeling or 3d printing or allow you to edit and color grade movies, which photoshop can do.

It can generate LUTs which can be used to color grade your video footage in something like davinci resolve ...

To be fair photographers use just a fraction of whats available in photoshop and affinity photo is able to match pretty much everything thats in photoshop that you would use.Thats pretty much true of most photo editors.

It's a shame Adobe has killed off Lightroom standalone but there is still Bridge and they give that away for free. That may be an alternative for lightrooms organisational abilities. I would still miss Lightroom thou.

Photoshop is essential if you are using flash. You will inevitably get reflections that can only be fixed by taking a second image with the flash at a different angle, taking the reflection out, but leaving you or your flashhead in the picture. You will need to select the two images, then send to PS as layers and mask-layer out the reflection. If you are only doing HDR you won't need PS but HDR can look rather strange in some situations and won't work well enough to bring outside detail from windows. If you are serious about real estate you must have Photoshop in your workflow.