Can mastertech 50inch uhd 4k android smart tv install outside apps?

Question edited for clarity.

There is a rather 'round about' way of doing it and it starts with your computer!

Installing Apps using APK Installer on my Sinotec TV Home screen

• Open your browser on your computer, find the APK file you want to download, and select it.
• Once the App is downloaded, open Downloads, right-click on the APK file, then save to USB or external storage device.
• To install this APK from your storage device to the TV, plug the USB into the TV.
• On your HOME screen, go to APK installer, and select the APP you would like to install
• The app will begin installing on your device.
• After the application has successfully been installed the user can run the app with no issues.
• Please Note: Only selected smart models have the "Install APK" function.

https://www.sinotec.co.za/support/faqs/

Specs for your television says it comes with

• Netflix
• YouTube
• Twitter
• Facebook
• Mirashare
• Digital Dvb-T2
• Child Lock

Sinotec 58" UHD Android TV

Sinotec https://www.sinotec.co.za > product > sinotec-58-uhd-...
Open Browser: Yes; Prime Video: Yes; Netflix: Yes; DSTV Now: Yes; Showmax: Yes ... STL-58G50UM. Sinotec 58? UHD NETFLIX LED TV. Resolution: 3840 x 2160. View ...

..

INSIGNIA NS-43F301NA22 43 inch Class F30 Series LED 4K UHD Smart Fire TV User Guide (manuals.plus)

Insignia NS-55F301NA22 55" Class F30 Series LED LCD 4K UHD Smart Fire TV Quick Setup Guide ' Manualzz

Looks like it may be too old? Lots of help below, but this seems hopeful.

https://community.roku.com/t5/Roku-setup/Roku-Ultra-with-an-older-HD-plasma-TV-with-1080i-resolution/td-p/561009

Does a Roku Stick Work on Any TV? The Roku Streaming Stick 4K is designed to be compatible with any TV that has an HDMI port. This means it will work on both smart and non-smart TVs, as long as they have an HDMI connection.
If your TV is analog, don't worry! You can still use the Roku Streaming Stick 4K by using an AV Composite Converter. This will allow you to enjoy all the features of the Roku Streaming Stick on your TV.

All Roku streaming players will work for any television with an HDMI connection, so any Roku player can be connected to a 4K UHD or HDR-compatible television. However, to stream movies and TV shows in 4K UHD or HDR you will need a compatible Roku streaming player and television that supports 4K UHD or HDR.
Jul 24, 2023

Do I need a special TV? - Roku Support

Roku https://support.roku.com > en-ca > article

Does Roku Work on Any TV? Here's What You Need to Know

The Home Theater DIY https://thehometheaterdiy.com > does-roku-work-on-a...
2 days ago - Yes, Roku does work on basically any TV as long as it has an HDMI port. Older, lower resolution TV's probably don't need the most updated 4k ...

How to set up your Roku streaming player or ...

Roku https://support.roku.com > Roku setup
Jul 24, 2023 - From a USB port on your TV Any Roku Streaming Stick supports USB power, but only some Roku players do. If you are connecting your Roku device ...

‎Roku TV · ‎Roku Streaming Stick 4K · ‎4K TV · ‎Roku Streaming Stick 4K+

Compatibility Unleashed: Does Roku Work on Any TV?

Automate Your Life https://automatelife.net > does-roku-work-on-any-tv
1 day ago - The Roku Streaming Stick 4K is designed to be compatible with any TV that has an HDMI port. This means it will work on both smart and non-smart ...

‎Does a Roku Stick Work on... · ‎Steps to Install Roku on an Old...

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Most likely you need to update either Play store or Play services. If you open the play store app on your TV and select "my apps" look for the updates and see if there is an update available.

Follow the supplies link. Setting up Stan on my Hisense Smart TV

Yes most like likely

If you wish to get more details visit the site linked here. http://homenol.blogspot.com/ http://elektrotricks.blogspot.com/

Why not. Just download it.