Yes, you should be able to install Windows 10 without any trouble on most H61 motherboards. Pretty much all of the Sandy bridge and Ivy bridge platforms are easily upgraded to Windows 10. Just about everything prior to Skylake, especially on some of the less common branded motherboards and most all of the OEM motherboards fails to show any driver support newer than Windows 8 but most of those systems that are still in use have already been upgraded to Windows 10 and if Windows 8 is supported, Windows 10 should be a non-issue.
Heck, I just installed Windows 10 on a Sempron system from like 2006. I had to install Windows 7 first, and then upgrade it to 10, but was able to get it on there in the end.
You should read ALL of these, before making any decisions or moving forward though. Probably you can simply plug in your Windows 8 product key when you get to the point in the installation where it asks you for it and usually it will automatically accept that and activate without a problem. Keep in mind though, there is ALWAYS a chance you could run into issues, with any system, so be aware of that possibility and make sure you have anything important backed up before you do this, and that might even include the OS if there is important information on there you can't live without.