I've added two OSes to my Windows 7, Win 8 and Win 10. But they're not booting. How do I get them booting

(if this exaxt same question has been asked and answered, please point me there and I will delete this question.)

I salvaged the HDD's from two broken laptops, a Win10 and a Win 8 system. Since it seems many people are cloning their HDD to SSD to avoid re-installing everything, I thought I'd try the same. I cloned their HDD's to my old Windows7 laptop to separate partitions. So now there are 3 partitions in total. I used a bootprogram (EasyBCD 2.2) to make a boot menu, which worked, I can see the 3 options. But I can not get the latter two to boot, the only thing that works is Windows 7.

Main question: HOW DO I GET THEM TO BOOT UP?

The partition-structure on the SSD is now, from left to right:

1. Windows 7

2. Win10 (errmessage: 0cx000000f "The Boot configuration File for this PC is missing of has Errors" File: \Boot\BCD)

3. Windows 8 (errmessage: 0xc0000428 "windows cannot verify the digital signature for this file" File: winload.exe

It advises me in both cases to repair this with installation media. But I don't have that.

I cloned the partitions with Partition Wizard, which is functionally the same as Macrium Reflect. Should I re-clone them with Macrium, or shouldn't that be the problem?

Interesting: after I cloned the W10 disk and booted it up, it did some sort of color testing. Almost as if the OS was adjusting itself to my hardware. Under Win7 I can see that it re-labeled itself to "SystemOS"

It seems to me, that the problem is the boot area. So solutions might be:

• Using some sort of software (even DISKPART?) that correctly analyzes this and repairs it.
• Moving Windows 10 to the front of the HDD.
• Getting the hardware to recognize all 3 OSes

What I cannot do is using installation media because I don't have that, and am not in a position to get that.