Attached is the script to uninstall the plugin fully, in case you need to switch from the Admin plugin to the Standard plugin or vice-versa. The script needs to be run as Administrator users (right click > Run as administrator).
The followings are the source code of the uninstall script:
@echo off
setlocal enabledelayedexpansion
echo uninstalling plugin
wmic product where name="npRTCCplugin" call uninstall
wmic product where name="SightCall" call uninstall
echo removing admin plugin directories
rd /S /Q "%programfiles(x86)%\npRTCCplugin"
rd /S /Q "%LOCALAPPDATA%\Microsoft\Windows\Temporary Internet Files\Virtualized\%programfiles(x86)::=%\npRTCCplugin"
rd /S /Q "%LOCALAPPDATA%\Microsoft\Windows\Temporary Internet Files\Virtualized\%programfiles(x86)::=%\SightCall"
rd /S /Q "%LOCALAPPDATA%\Microsoft\Windows\INetCache\Virtualized\%programfiles(x86)::=%\npRTCCplugin"
rd /S /Q "%LOCALAPPDATA%\Microsoft\Windows\INetCache\Virtualized\%programfiles(x86)::=%\SightCall"
echo removing plugin admin registry
reg delete "HKLM\Software\Classes\MIME\Database\Content Type\application/x-rtccplugin" /f
reg delete HKLM\Software\Classes\Weemo.RTCCplugin /f
reg delete HKLM\Software\Classes\Weemo.RTCCplugin.1 /f
reg delete HKLM\Software\Classes\AppID\npRTCCplugin.dll /f
reg delete HKLM\Software\Classes\TypeLib\{0EC6BD6E-769A-5F78-8996-F2A1D576451A} /f
reg delete HKLM\Software\Classes\CLSID\{391FC6DF-AB5E-5D6D-B858-4D80639C99E1} /f
reg delete HKLM\Software\Classes\Wow6432Node\CLSID\{391FC6DF-AB5E-5D6D-B858-4D80639C99E1} /f
reg delete HKLM\Software\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKLM\Software\Wow6432Node\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKLM\Software\Mozilla\NativeMessagingHosts\com.sightcall.firefox.driver /f
reg delete HKLM\Software\Wow6432Node\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKLM\Software\MozillaPlugins\sightcall.com/RTCCplugin /f
reg delete HKLM\Software\Wow6432Node\MozillaPlugins\sightcall.com/RTCCplugin /f
FOR /F "tokens=7 delims=\" %%A IN ('reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList" /s ^| findstr /R ProfileList') DO (
echo removing vcam driver for user %%A
reg delete HKU\%%A\Software\Classes\CLSID\{57272CF4-9FA5-45C5-BA4C-3F588F22B946} /f
reg delete HKU\%%A\Software\Classes\CLSID\{860BB310-5D01-11D0-BD3B-00A0C911CE86}\Instance\{57272CF4-9FA5-45C5-BA4C-3F588F22B946} /f
reg delete HKU\%%A\Software\Classes\Wow6432Node\CLSID\{57272CF4-9FA5-45C5-BA4C-3F588F22B946} /f
reg delete HKU\%%A\Software\Classes\Wow6432Node\CLSID\{860BB310-5D01-11D0-BD3B-00A0C911CE86}\Instance\{57272CF4-9FA5-45C5-BA4C-3F588F22B946} /f
echo removing plugin user registry for user %%A
reg delete "HKU\%%A\Software\Classes\MIME\Database\Content Type\application/x-rtccplugin" /f
reg delete HKU\%%A\Software\Classes\Weemo.RTCCplugin /f
reg delete HKU\%%A\Software\Classes\Weemo.RTCCplugin.1 /f
reg delete HKU\%%A\Software\Classes\AppID\npRTCCplugin.dll /f
reg delete HKU\%%A\Software\Classes\TypeLib\{0EC6BD6E-769A-5F78-8996-F2A1D576451A} /f
reg delete HKU\%%A\Software\Classes\CLSID\{391FC6DF-AB5E-5D6D-B858-4D80639C99E1} /f
reg delete HKU\%%A\Software\Classes\Wow6432Node\CLSID\{391FC6DF-AB5E-5D6D-B858-4D80639C99E1} /f
reg delete HKU\%%A\Software\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKU\%%A\Software\Wow6432Node\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKU\%%A\Software\Mozilla\NativeMessagingHosts\com.sightcall.firefox.driver /f
reg delete HKU\%%A\Software\Wow6432Node\Google\Chrome\NativeMessagingHosts\com.sightcall.chrome.driver /f
reg delete HKU\%%A\Software\MozillaPlugins\sightcall.com/RTCCplugin /f
reg delete HKU\%%A\Software\Wow6432Node\MozillaPlugins\sightcall.com/RTCCplugin /f
)
FOR /F "tokens=*" %%A IN ('reg query "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList" /s ^| findstr /R /C:"ProfileImagePath.*Users"') DO (
set users=%%A
set replacedusers=!users: =;!
FOR /F "tokens=3 delims=;" %%B IN ("!replacedusers!") DO (
echo removing user directory for %%B
set userdata=%%B
rd /S /Q "!userdata!\AppData\Roaming\npRTCCplugin"
rd /S /Q "!userdata!\AppData\Roaming\SightCall"
rd /S /Q "!userdata!\AppData\Local\Microsoft\Windows\Temporary Internet Files\Virtualized\!userdata::=!\AppData\Roaming\npRTCCplugin"
rd /S /Q "!userdata!\AppData\Local\Microsoft\Windows\Temporary Internet Files\Virtualized\!userdata::=!\AppData\Roaming\SightCall"
rd /S /Q "!userdata!\AppData\Local\Microsoft\Windows\INetCache\Virtualized\!userdata::=!\AppData\Roaming\npRTCCplugin"
rd /S /Q "!userdata!\AppData\Local\Microsoft\Windows\INetCache\Virtualized\!userdata::=!\AppData\Roaming\SightCall"
)
)