My 2015 iMac (which  is currently located  at the 1890s cottage in the south east corner of Adelaide),  is old.   It  has a Mac Monterey O/S circa 2021  and   I've recently discovered  that Adobe's  Lightroom and Photoshop  no longer work  on this  old Mac operating system. 

Dam. Dam. Dam. I have  historically used  the iMac for  my digital photography:

So I have moved to Affinity Photos for the  photographic post processing of the  digital photographs on  the Mac in the short term -- until I am in a financial position to  upgrade the iMac consumer  computer  to something more professional (eg., a Mac Studio).  I haven't  really enjoyed  working with  Affinity Photo -- it's free  but  I really do  miss the Library component of Lightroom. So it is a case of  hanging in there until I upgrade and  that depends on me  selling  the cottage. 

I am currently at the cottage  painting it.

The reality is that digital photography is  the future and the  ongoing technological innovations --eg.,  Fujifilm's medium format GFX system  -- require powerful and expensive computing power and storage. This is an ongoing technological treadmill. It appears that the Sony Semiconductor Solutions Group (SSSG) is (rumoured to be) in the process of upgrading its 100 MP medium format sensor to a 180 MP one. That means the former sensor will eventually no longer be made, which is what happened to the 50MP sensor when the 100 MP was introduced. The medium format market (Fujifilm and Hasselblad) is too small  for Sony to make both. 

Hopefully this 180 MP  sensor is someway off before it, and a suitable medium format camera (the successor to  the current Fuji GFX 100 II1?), reaches the market. A couple of years maybe?