Cannot detect installed version set up will now exit

[system]

Unable to Install or Update UiPath Studio in machine.

While installing/updating Studio we may face below errors:

Popup with "Cannot detect installed version set up will now exit" error.
or
"An instance of UiPath Platform Installer is already running."
or
Log error shows "Could not find Registry key SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\{6095A623-D2D5-4DE5-852B-4****}
   at UiPath.StudioCAs.Extensions.RegistryToolsExtensions.GetDisplayVersionByProductCode(String productCode)
   at UiPath.StudioCAs.SessionManager.ValidateVersionUpgrade(String& errorMessage)" error.

This issue comes if the old studio is not properly removed from the machine which is not allowing the new Studio to install/update. 

Please follow below approaches:
Approach 1:

1. Open the MSI log and look for the UiPath Product ID.
2. Open Registry Editor (regedit.exe) and go to the following registry key:
   \HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\
3. Search the UiPath Product ID (e.i. "{CA94574A-9591-4278-9269-0F5FB01F***}") found in step 1.
4. Expand the Product Folder Key and go to the SourceList Sub-key.
5. PackageName key can be missing or it's value wouldn't be same as per the present msi name (like StudioUipath.msi).
6. Add a new key if missing and write the msi exact name like UiPathStudio.msi as the value.
7. Restarted the machine.

Approach 2:

1. Install the old studio version with same exe or msi installer as it was installed before.
2. Once done, updated it using the new exe/msi version of installer.