Rather than downloading from unverified sources which may pose security risks, you can stream the series through official channels:
If you found this filename on a file-sharing site, ensure your antivirus software is active, as "PLZPROPER" tags are sometimes spoofed by malicious actors to encourage downloads of compromised files. download-the-rookie-s05e01-720p-web-h264-plzproper-mkv
The most recent episodes and full seasons are typically available on Hulu. Rather than downloading from unverified sources which may
"PLZPROPER" indicates this version was released to fix issues (like audio sync or missing frames) found in a previous "Proper" or initial upload. Where to Watch Legally ensure your antivirus software is active