Upgrade from Win7 Ultimate to Win 10, all versions?

For the administration of club members I have a laptop on which besides the Windows 7 Ultimate 64 bit i.a. A banking program is; this program has a new version that has some problems with Win7.

So I want to upgrade Win7 to Win 10, does that work with all versions or does it depend on the installed Ultimate version?

The 7 Ultimate gives a 10 Pro.

However, SP1 must already be installed.

SP1 of 7 or 10?

Of course, Windows 7.

Thanks a lot! I read here in another post that may cause an upgrade problem, so it's better to do a complete re-installation.

but I do not want to reinstall everything, what do you mean?

I think that's the same way.

But: I would upgrade (license history) and then make a reinstall, if there are any "funny things".

Before that, I would actually do in Image voin the current Windows7 installation. At least if there's really important data on it.

Otherwise, rather completely new and not upgrade if a Windows 10 license is there.