Here's how to Downgrade Microsoft Edge Version on Windows PC.
i. here are the steps on how to downgrade Microsoft Edge version on Windows PC:

Uninstall the current version of Microsoft Edge.
Download the older version of Microsoft Edge from the Microsoft website.
Run the installer for the older version of Microsoft Edge.
Follow the on-screen instructions to complete the installation.

Here are the detailed steps:

Uninstall the current version of Microsoft Edge:
Open the Settings app.
Go to Apps - Apps & features.
Search for Microsoft Edge.
Click on Microsoft Edge and then click on Uninstall.
Click Uninstall again to confirm.

Download the older version of Microsoft Edge from the Microsoft website:
Go to the Microsoft Edge download page.
Select the older version of Microsoft Edge that you want to download.
Click on Download.

Run the installer for the older version of Microsoft Edge:

Double-click on the downloaded file to run the installer.
Follow the on-screen instructions to complete the installation.

Once you have completed these steps, you will have downgraded Microsoft Edge to the older version.
Please note that you may not be able to downgrade Microsoft Edge to a version that is older than the version that was installed on your computer by default.

ii. There are a few ways to disable Microsoft Edge auto update.
Method 1: Use the Registry Editor.

Open the Registry Editor.
Navigate to the following key:

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Edge

Create a new DWORD value named DisableAutomaticUpdates.
Set the value of the DisableAutomaticUpdates DWORD to 1.
Restart your computer.

Method 2: Use the Group Policy Editor.

Open the Group Policy Editor.
Navigate to the following setting:

Computer Configuration - Administrative Templates - Windows Components - Microsoft Edge

Double-click on the setting named Turn off automatic updates.
Select the Enabled option and click OK.
Restart your computer.

Method 3: Use the Command Prompt.

Open the Command Prompt as an administrator.
Type the following command and press Enter:

reg add HKLM\SOFTWARE\Policies\Microsoft\Edge /v DisableAutomaticUpdates /t REG_DWORD /d 1 /f

Restart your computer.

Once you have completed any of these steps, Microsoft Edge will no longer automatically update.
Please note that disabling automatic updates may make your computer more vulnerable to security threats.

iii. Here are some known issues in old versions of Microsoft Edge:

Security vulnerabilities: Old versions of Microsoft Edge may contain security vulnerabilities that could allow attackers to exploit your computer.
Bugs and performance issues: Old versions of Microsoft Edge may contain bugs that could cause unexpected behavior or performance issues.
Compatibility issues: Old versions of Microsoft Edge may not be compatible with newer websites or extensions.

If you are using an old version of Microsoft Edge, it is important to update to the latest version as soon as possible. Updating to the latest version will help to keep your computer safe from security vulnerabilities and will also ensure that you have the latest features and performance improvements.
You can update Microsoft Edge by going to the Microsoft Edge website and clicking on the "Download" button. Once the download is complete, run the installer to update your browser.
If you are unable to update Microsoft Edge, you may want to consider using a different browser. There are many other browsers available that are more secure and up-to-date than old versions of Microsoft Edge.

iv. There have been a number of reported issues in (OLD) versions of Microsoft Edge. Here are a few examples:

Incompatibility with certain websites: Some websites may not work properly in Microsoft Edge.
Performance issues: Some users have reported performance issues with Microsoft Edge.
Bugs: Microsoft Edge is still under development, and as such, there are some bugs that can cause unexpected behavior. These bugs are usually fixed in subsequent updates, but they can be frustrating for users who encounter them.
Tabs not closing properly: Some users have reported that tabs are not closing properly in Microsoft Edge. This can be a frustrating issue, as it can lead to tabs being left open and using up system resources.
Bookmarks not syncing: Some users have reported that bookmarks are not syncing properly between devices in Microsoft Edge. This can be a problem if you use multiple devices and want to keep your bookmarks in sync.
Extensions not working properly: Some extensions may not work properly in Microsoft Edge. This can be due to a number of factors, such as the extension not being compatible with the latest version of Edge or the extension being blocked by Edge's security features.
Crashing: Some users have reported that Microsoft Edge crashes frequently. This can be a serious issue, as it can lead to data loss or other problems.

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