Have been on-board with Luminar since the beginning, both as a plug-in with Aperture and as an extension with PHOTOS.
It sounds like 2018 may not have installed as an extension for your PHOTOS.
Try opening System Preferences } extensions. Then open Photos Editing, if Luminar 2018 isn't checked do so. If it is, then that's not the problem.
Then open PHOTOS; select an image, click on "edit". That should open several icons across the top. You should see a circle with 3 horizontal dots. Click on this --Luminar 2018 should appear, click on this and voila!
If none of that works contact SKYLUM.
You need another panel showing printers, papers and inks.
I feel your pain.
I have continued using Aperture for cataloguing and simple editing, but gave switched to Luminar 2018 for extensive, advanced editing. They are a 1 time purchase, and not too expensive. They promise to have a cataloguing component in the near future, which would then make them a complete post processing tool. It can be used with PHOTOS and as such you can use Photos for cataloguing and Luminar for editing.
Wow, didn't know there was so many "yunsers" out there
To begin with, be sure to spell PittsburgH correctly, or abbreviate it-- Pgh.
In addition to those you mentioned look for Phipps conservatory in the Oakland section of town. Also in Oakland is the U of Pitt (many interesting shots--in and out), e.g. the "nationality rooms". Right there is also Carnegie museum and art center.
Downtown/ Northside - "The Point" park where the 3 rivers come together and the BB and FB fields are.
Finally, take the Incline up to Mt Washington for beautiful scenes of the city and the rivers.
I have just scratched the surface. Pgh is truly a little known/appreciated gem of a city.
Would love to hear your impressions afterward.
Since you have been using Aperture I assume you are on a Mac. If that is true, then moving you entire library to Photos is an option, and is easy. I did that some time ago. I now have my entire library in both Ap & Ph on my iMac. In addition, I have Luminar 2018 available for both and am waiting for Luminar to come out with their "catalog management" component to then have a single, all encompassing app. Hopefully I can then use Luminar exclusively as a stand alone.
Aperture for preliminary work and Luminar for final product
I too committed to Aperture and have continued to use it. I tried LR, but found it cumbersome compared to Aperture.
I am now committed to Luminar, which I have found to be as easy as Aperture, but much more sophisticated. I am hoping that when Luminar comes out with their DAM I will be able to completely move my Library to Luminar and retire Aperture.
Don't overlook the new MacPhun "Luminar". Presently only for Macs but soon for Windows.
Easy to learn and fun to use.
If, by chance, you have a Mac take a look at Macphun's LUMINAR. Not very expensive and fun and easy to use.
In addition to the suggestions already put forth I shoot each picture in bursts of 2 or 3. In this way I hope to get one that is sharper than the others. With the size and low cost of todays SD cards there is no problem with that many shots. Then at home on your big screen you can choose the sharpest image and delete the others.