Would love to copy complete Win10 installation from old to new PC?

Yes. Assuming both computers already have Windows installed, just
1 make a system image of the old one onto an external drive, and
2 backup the drivers in the new one onto an external drive, and
3 make a system image of the new one onto an external drive [in case you ever change your mind about what you are doing], and
4 restore the C:\ drive [OS drive] part of the old one's system image to the new one, and
5 restore the new one's drivers to the new one.

my ditty - File backup vs imaging, imaging utilities, backing up drivers [post #3] - TenForums
Backup and Restore Device Drivers - TenForumsTutorials

All the best,
Denis

Yes, you can make an Image file of your old computer and save it to a USB HDD. Then attach the USB HDD to the new computer and transfer the image file to your new computer. However, being that the old computers are 10 or so years old, their hardware would be different, and the old computer is probably running Windows 7 while your new computer is probably running Windows 10 or maybe Windows 11.
It's best to copy your User Files (Ie) Documents, Desktop, Pictures etc to a USB HDD and transfer them to the new computer. You will have to reinstall any Programs.

I should have said they are both running Win10 Pro

- - - Updated - - -

And it's that reinstall all the programs that takes ages and is potentially error prone. I have Macrium images of both systems and all the data is backed up elsewhere. It still makes it a long and tedious process with regular manual activity 🙁

So you are well-prepared for the system image-based approach I suggested.

All the best,
Denis

So you are well-prepared for the system image-based approach I suggested.

You already have an image file,
If you haven't yet, create a Windows PE Rescue USB Flash drive of Macrium Reflect. Boot off of the USB Flash Drive and restore your image of the old computer to the new one.

tpriest said:

I sometimes think I'd like to replace both my desktop and laptop PCs, both 10 or so years old and still going strong, for more modern systems, but the thought of installing all the software again, going through all the updates, etc., personalising it and so on, just doesn't bear thinking about as far as I'm concerned.
Would that the Apple approach be possible, in a similarly easy manner, for a Windows system!

spunk said:

Yes, you can make an Image file of your old computer and save it to a USB HDD. Then attach the USB HDD to the new computer and transfer the image file to your new computer. However, being that the old computers are 10 or so years old, their hardware would be different, and the old computer is probably running Windows 7 while your new computer is probably running Windows 10 or maybe Windows 11.

I have successfully transferred My Windows 10 (upgraded in 2015 from its original OEM Windows 7) and all its installed software from my ten year old Legacy bios/MBR laptop (System One in my specs below) to a new UEFI/GPT laptop (System One on Eleven Forum) then upgraded that to Windows 11. The two systems couldn't have more different hardware, the old one has an Intel Pentium with Intel HD graphics and the new one an AMD Athlon with Radeon graphics.

The method was to first make a Macrium system image of the old machine. Then I clean installed the same edition of Windows 10 (21H1) on the new PC in order to create all the required EFI partitions. Next I used the Macrium recovery boot usb to first delete just the C: partition of the clean install, then to replace it with the C: partition from my system image. The final step was to use the Macrium recovery 'Fix Windows boot problems' tool to rebuild the BCD table.

On first boot Windows loaded all the correct drivers for the new hardware, restarted, then went to a fully working desktop with all the installed software intact and working as before. A few weeks later Windows Update offered the upgrade to Windows 11, which I took.

For the less technically inclined, laplink's PCmover product still does the job. I used it last year to migrate my wife's runtime environment from the old SFF mini-ITX PC to the new Dell 7080 Micro she now uses for her daily driver. Worked like a charm.
HTH,
--Ed--

Find their stuff at Laplink(R) – Homepage. Deals are widely available so you may want to buy this somewhere else.

I used Laplink about two years ago to move from a 2012 vintage desktop to a 2019 laptop, both running Win 10. The desktop was running Pro and the laptop Home, but overall Laplink did a great job moving lots of programs. Only real issue was Norton Internet Security, which I had to re-install and then go through the cockamamie Norton system to unlink and old system and link in the new one. But next time, I will use @Bree's instructions in post #7.

Thanks for all these replies, most interesting and will help me when I do update my PCs.

Still not as straightforward as Apple though