Cant run lastest iMovie need old version...??

Forget about that Amazon iLife '05 disc as it is 8 years out of date from the iMovie 9.0.9 that you can get as a direct download from Apple.

If you launch the Mac App Store with the same Apple ID as you were using before your drive replacement, and click cmd+0 (zero) to expose the Purchased panel, it may show iMovie among your purchased applications. If a blue outlined cloud with a down arrow appears adjacent to iMovie, and you click that, it may offer to download the last compatible version (10.1.14) for Mojave. If not, you are stuck with iMovie 9.0.9 (32-bit application).

[Update… I see you resolved this via the Mac App Store]

jeffg59 wrote:

Ok, I do not see the purchased tab.

Okay I wasn't sure when "Purchased" changed. Click your name on the bottom left.

Also, I was going to purchase a disc on eBay..do you know what version would be compatible?

iLife '05 is 17 years old. It's not going to work.

High Sierra 10.13.6 as per below image

If you downloaded iMovie previously, open the App Store, checked "Purchased", locate iMovie and download it from there. If you hadn't downloaded iMovie before, you can't get an older version.

FWIW…

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Good question and I'm not sure. Just check the Purchased tab, if it's listed, you can download it.

On the first Purchased screen, click the download icon, not on the iMovie icon.

You're welcome.