OS MOJAVE CAN BE ONLY INSTALLED ON 10.8 OT LATER ? HIGH SIERRA WANT LET ME

Here are the requirements for installing Mojave: macOS Mojave - Technical Specifications

If your computer does not meet these requirements you can not install Mojave. Old non-supported hardware; no drivers; different hardware; ...

Here are the hardware requirements:

These Mac models are

compatible with macOS Mojave:

• MacBook (Early 2015 or newer)
• MacBook Air (Mid 2012 or newer)
• MacBook Pro (Mid 2012 or newer)
• Mac mini (Late 2012 or newer)
• iMac (Late 2012 or newer)
• iMac Pro (2017)
• Mac Pro (Late 2013; Mid 2010 and Mid 2012 models with recommended Metal-capable graphics cards)

Your mid 2010 iMac clearly is not on the list of supported models/years.

Yep, a newer Mac is the only way to go higher. & the new ones won't run Mojave, likely Monterey or newer only.

But you could buy a used iMa that is newer tan your 2010 model...

Used & Refurbished iMacs, iMac Desktops | Mac of All Trades

Which exact Mac do you have?

Apple Logo at top left, About this Mac...

The only “upgrade” you can do to the hardware that will allow anything higher than High Sierra to run is to buy a new Mac.

vivah61 wrote:

Mine is Mid 2010 but iMac .Oh gezz....What the solution ? upgrade hardware ? Thank You

If you want/need to run Mojave the only option you have is a newer computer.

Understood, take care my friend! :)