How to stop Advanced Mac Cleaner from installing?

Advanced Mac Cleaner popup?

Note: With Advanced Mac Cleaner malware, after the first scan, immediately restart and do a second scan to stop AMC from rewriting files.

1. Use MalwareBytes for Mac to remove malware/adware.

Install guide: https://support.malwarebytes.com/docs/DOC-1817

Uninstall Guide: https://support.malwarebytes.com/docs/DOC-1190

The installer may ask you to allow it in Security & Privacy /System Preference. Allow it.

2. Disable all extensions and test.

Turnoff or uninstall extensions.

Section: Manage extensions: https://support.apple.com/guide/safari/use-safari-extensions-sfri32508/mac

3. Choose a search engine.

Delete all text in the Smart Search field, click the magnifying glass , then choose a search engine from the list.

https://support.apple.com/guide/safari/customize-your-search-ibrwe75c2a3c/mac

4. Set your Home Page. https://support.apple.com/guide/safari/set-your-homepage-ibrw1020/mac

5. Restart your Mac.

6. Launch Safari holding the Shift key down.

Malwarebytes - https://www.malwarebytes.com/pricing/ - There are different versions available depending upon what features you want.. For a single removal without ongoing monitoring you can probably use the free version.

Don't click on any buttons saying "install".