rgrenaderphoto wrote:
Problems with any Windows upgrade to a new major OS can be traced to doing an on disk conversion. Going from XP to 7 or 7 to Win 8-10, I always do a clean install, and have zero problems. And once you do, Canon Pixma printers work beautifully.
Many of the same things can be said for Macs. It is true that if you are running a 64-bit OS, 32-bit software MAY be a problem. Apple has banned it from their App Store, and will not guarantee it will run after this summer (it may, but they're not testing any 32-bit apps to find out). Their next OS release will be "pure" 64-bit. Developers are madly scrambling to release relevant updates. You can bet that equipment more than five years old or so is considered irrelevant!
Either platform works best when you back up the entire drive to an external drive, using a "cloning" program. Then, ERASE the internal drive (or replace it with a new, larger, faster one!) and install a completely virgin copy of the new operating system. Next, "add back" all your software from the original sources (or the latest versions that can be had online). Next, perform any updates available for the OS and all your software. Finally, copy the data you want on your startup drive back to your startup drive.
Occasionally, you may find that a particular hardware component of your system does not have a compatible driver for the new operating system. So BEFORE updating, if your system is more than five years old, you may want to consult the manufacturers of ALL sub-systems and peripherals, to be sure compatible drivers are available. This includes graphics adapter cards, SCSI interface cards, scanner drivers, printer drivers, add-in sound cards... Without compatible drivers, you may need to replace something or limit your OS upgrade to the latest version that will support your devices. It is also wise to check with all your software providers to be sure your existing software will run on the new system! Often, a new OS version will require an update, an upgrade, or replacement of an application.
I've been following this "clean install" regimen since 1987, and have had very few problems. I usually take the opportunity to crack the case of an older computer, and REPLACE the hard drive, UPGRADE the memory to the maximum, UPGRADE the graphics adapter if possible, REPLACE broken optical drives if present... Full instructions are available online from many sources. iFixIt.com is one. OWC/Macsales.com is Mac-centric. The entire migration process can take several days, or a week of evenings, but your personal time is possibly less expensive than a new computer!
For years, Windows has had a "compatibility mode" for older software. MANY of the older programs dating back to the late 1980s and early 1990s will run in compatibility mode. So before you give up on older software, try contacting the developer and ask how to get it running in compatibility mode. If the developer is gone, try Internet user forums. There may be suitable work-arounds.
It's pretty safe to assume that almost any software released a decade earlier than your new OS will present at least minor challenges. Hardware over five years old may not have the resources to keep up with the latest code, or may offer only limited functionality. For instance, Adobe Lightroom Classic CC 2018 lacks a couple of features on my 2010 Mac Mini. Its graphics adapter lacks a required feature for those functions. All the other features work, though a little slowly.
Epson DID get smart a few years back. They began writing more universal drivers that support many different models.