i can not upgrate os

missr0 Said:

"[...]it just get stucks on this page. I press install and nothing happens. even after deleting the app, restarting computer and pressing on link again"

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Redownload the Installation File:

Re-download it, going here:

1. Go Here: How to update the software on your Mac - Apple Support
2. Scroll Down: to the How to get updates for earlier macOS versions pane
3. Proceed from there as necessary.

If that is no success, isolate the issues:

• Create a New Administrator: Try the install that way. If It works, then it is something configured in your current user.

• Boot into Safe Mode: If of no success, then bot into Safe Mode (Hold Down: Shift key upon boot). Caches and all other unnecessary items are put aside when booting into it.

• USB Bootable Installer: If neither of the above is of success, create and use a USB Bootable Installer, and proceed from there.

Depending on your specs you may be able to upgrade to El Capitan, High Sierra, Mojave or Catalina.

macOS - How to Upgrade - Apple

Try this:

Delete the file "Install Mac OS Catalina" from your Applications folder. Then restart and use this link to download Catalina again:

Get macOS Catalina

Hello,

What is your Macintosh’s exact model number and what version of the system software is it running?

Choose the Apple Menu  > About This Mac

Check in your Applications folder for a file named "Install Mac OS Catalina" and double-click on it. If that does not install please tell us what message you get.

Not sure I don't think I've seen that one before.