I can't find the updated version of mt4 for my iMac

..Officialjem_..

Perhaps to identify the iMac 27-inch model and build year may help

to fully explain, which system you'd hope to update or upgrade that

computer to; since Catalina and subsequent version macOS are old.

How to download and install macOS - Apple Support

//support.apple.com/en-us/HT211683

[Some software has no update path to partial newer models, if / when

'third-party' makers of software have few or no reasons to go further.]

Find out which macOS your Mac is using - Apple Support

//support.apple.com/en-us/HT201260

Big Sur and later macOS versions would have newer abilities to run

later series of applications, from some other makers. Which ones?

•more recent versions ~ back to catalina•

macOS Sonoma 14.1.1

macOS Ventura 13.6.2

macOS Monterey 12.7.1

macOS Big Sur 11.7.10

macOS Catalina 10.15.7

•Which computers can use the latest macOS versions?•

• macOS Sonoma 14 is compatible with these computers
• macOS Ventura 13 is compatible with these computers
• macOS Monterey 12 is compatible with these computers
• macOS Big Sur 11 is compatible with these computers
• macOS Catalina 10.15 is compatible with these computers

iMac (Retina 5K, 27-inch, 2020)

Model Identifier: iMac20,1, iMac20,2

Part Numbers: MXWT2xx/A, MXWU2xx/A, MXWV2xx/A

Newest compatible operating system: macOS Sonoma

Tech Specs: iMac (Retina 5K, 27-inch, 2020)

User Guide: iMac (Retina 5K, 27-inch, 2020)

iMac (Retina 5K, 27-inch, 2019)

Model Identifier: iMac19,1

Part Numbers: MRQYxx/A, MRR0xx/A, MRR1xx/A

Newest compatible operating system: macOS Sonoma

Tech Specs: iMac (Retina 5K, 27-inch, 2019)

User Guide: iMac (Retina 5K, 27-inch, 2019)

[an 'iMac Pro' model exists between these two models]

iMac (Retina 5K, 27-inch, 2017)

Model Identifier: iMac18,3

Part Numbers: MNE92xx/A, MNEA2xx/A, MNED2xx/A

Newest compatible operating system: macOS Ventura

Tech Specs: iMac (Retina 5K, 27-inch, 2017)

User Guide: iMac (Retina 5K, 27-inch, 2017)

iMac (Retina 5K, 27-inch, Late 2015)

Model Identifier: iMac17,1

Part Numbers: MK462xx/A, MK472xx/A, MK482xx/A

Newest compatible operating system: macOS Monterey

Tech Specs: iMac (Retina 5K, 27-inch, Late 2015)

User Guide: iMac (Retina 5K, 27-inch, Late 2015)

iMac (Retina 5K, 27-inch, Mid 2015)

Model Identifier: iMac15,1

Part Numbers: MF885xx/A

Newest compatible operating system: macOS Monterey

Tech Specs: iMac (Retina 5K, 27-inch, Mid 2015)

User Guide: iMac (Retina 5K, 27-inch, Mid 2015)

iMac (Retina 5K, 27-inch, Late 2014)

Model Identifier: iMac15,1

Part Number: MF886xx/A

Newest compatible operating system: macOS Big Sur

Tech Specs: iMac (Retina 5K, 27-inch, Late 2014)

User Guide: iMac (Retina 5K, 27-inch, Late 2014)

iMac (27-inch, Late 2013)

Model Identifier: iMac14,2

Part Number: ME086xx/A, ME088xx/A

Newest compatible operating system: macOS Catalina

Tech Specs: iMac (27-inch, Late 2013)

User Guide: iMac (27-inch, Late 2013)

iMac (27-inch, Late 2012)

Model Identifier: iMac13,2

Part Number: MD095xx/A, MD096xx/A

Newest compatible operating system: macOS Catalina

Tech Specs: iMac (27-inch, Late 2012)

User Guide: iMac (27-inch, Late 2012)

iMac (27-inch, Mid 2011)

Model Identifier: iMac12,2

Part Number: MC813xx/A, MC814xx/A

Newest compatible operating system: macOS High Sierra

Tech Specs: iMac (27-inch, Mid 2011)

User Guide: iMac (27-inch, Mid 2011)

[..These Intel-based "iMac 27-inch" run select versions macOS High Sierra ~ macOS Sonoma..]

At some point you will have to correctly identify your model specification and choose

an upgrade path to some later macOS which runs on your Intel-Mac. ~ Check first

to see what version your third-party software maker suggests they still support first.

You could see which version Meta Trade 4 for macOS might work, or

require special adaptation to run under MacOS in some other OS..

https://duckduckgo.com/?t=ftsa&q=meta+trade+4+for+macOS&ia=web

Sorry... what is "mt4"?