Currently you can only download it from a broker. MT4 is discontinued and has only been receiving minor or critical updates for several years.
I strongly recommend you to use MT5.If you had used this (before posting), you would have found (among 300+) Where to download MT4? - General - MQL5 programming forum (2017)
How To Ask Questions The Smart Way. (2004)
How To Interpret Answers.
RTFM and STFW: How To Tell You've Seriously Screwed Up.
It has been years since you could download MT4 from Metaquotes. You can only get it from a broker's website.
Where to download the orginal MT4 installer - MQL4 programming forum (2018)
Possibly MetaQuotes' MT4 Installation Link
If you had used this (before posting), you would have found (among 300+) Where to download MT4? - General - MQL5 programming forum (2017)
How To Ask Questions The Smart Way. (2004)
How To Interpret Answers.
RTFM and STFW: How To Tell You've Seriously Screwed Up.
It has been years since you could download MT4 from Metaquotes. You can only get it from a broker's website.
Where to download the orginal MT4 installer - MQL4 programming forum (2018)
Possibly MetaQuotes' MT4 Installation Link
That link, even if the file is called mt4setup.exe, installs MT5. Do the test yourself.

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I can't install mt4 on my computer!