LS wrote:
I find it interesting, and somewhat annoying, that all the support people and or repair people tell you it will be no problem, but when you ask real users they almost always have problems When installing new operating systems in older computers
I'm a real user. I had no problems with migration to Mojave. However...
I bought a brand new SSD. I did surgery on my iMac and installed it (and doubled RAM to 16GB while in there).
I put the old startup drive in an external USB 3 connected enclosure, and booted the iMac from the external drive (just hold down OPTION at startup until you see a menu of available drives).
I downloaded the Mac OS 10.14.3 Mojave installer from Apple's web site to the old startup drive.
I used the installer to format the new drive as an APFS volume.
I installed a VIRGIN copy of Mac OS Mojave onto the new internal drive.
I rebooted the iMac to the new 2 TB SSD and used Apple Migration Assistant (from the Utilities folder in the Applications folder of the new drive) to move all my files and compatible software from the old startup drive over to the new one.
I upgraded or updated all the software to the latest versions. I deleted a couple of programs that won't run on Mojave (I still have them on the old startup drive, should I need them).
I did need to have handy my Apple ID and Password for iCloud/iTunes/App Store access.
I did need to have handy my Adobe ID and Password to reconnect the Creative Cloud app and Photography Bundle apps.
I did need to have handy my Microsoft ID and Password to register Office 365.
All the apps I ever bought on the App Store, that are still available and 64-bit clean, got updated (I turned on Auto Update).
I did have to manually update Firefox, VLC, Handbrake, SilkyPix Developer Studio, Graphic Converter 10, my Epson apps, Kindle Reader, Acrobat Reader DC, and a few utilities...
Once I had everything updated, I plugged in a new 2TB conventional hard drive and backed up EVERYTHING with Time Machine.
My system is ROCK SOLID. And it FEELS many times faster than it did when new.
I still get some nag dialogs about 32-bit apps "not being optimized for my computer", but I'm sure the developers will address them, one way or another, before Mac OS 10.15 (yet to be named) comes out this Fall.