Install VC++ 2017Streamlabs OBS requires some additional files to be installed on your system before using the software else it might run into issues. Please download and run both of these Microsoft Visual C++ 2017 redistributables and reboot your computer afterward.
Updated Drivers and SoftwareMake sure that your drivers, especially your video graphic card drivers, and Windows are fully up to date. If you did update any drivers or software, make sure that you have rebooted your computer before continuing.
Open FirewallIt is important to open your firewall for Streamlabs OBS to properly connect to the internet and allow the various used widgets, like Alert Box, to get updated promptly. If you do not have any other firewall installed then you can follow this article to open the Windows Firewall. And if you also have another installed firewall make sure you whitelist Streamlabs OBS for both 'public' and 'private' network.
Whitelist in Anti-VirusIf you have an anti-virus software installed on your computer make sure to whitelist Streamlabs OBS (C:\Program Files\Streamlabs OBS\Streamlabs OBS.exe) to prevent it from scanning this executable and child-processes. Perhaps you want to whitelist the whole folder containing the executable as well. By whitelisting you prevent your anti-virus from scanning each and every alert or widget update that happens which could cause displaying issues!
First Run (Clean)If you are new to Streaming, skipped the import, or have used another streaming software you are presented with a default empty scene collection. The first thing you need to do is to check the check the Base (Canvas) Resolution and Output (Scaled) resolution found in Settings > Output and set the Base to your native monitor resolution and the output to what you stream at. Doing so you can setup your scenes on the aspect ratio native to your monitor.
First Run (Import)Streamlabs OBS is able to transfer one profile and all scene collections from OBS Studio if the software detects this has been installed on your system. Once you have imported the selected profile and scene collections you need to make some slight changes to use the built-in widgets.
Did Not Ask To ImportIf Streamlabs OBS did not ask you to import OBS Studio profile and scenes then it might not have been properly installed on your system. Close Streamlabs OBS and then re-install OBS Studio with the latest installer, no need to uninstall, properly. After that open Streamlabs OBS again and head to Settings > General and select Clear Cache and Restart found in the General section. This will wipe all user data and start Streamlabs OBS clean again, like the initial run.
Adjusting for Streamlabs OBSAfter you have imported your scenes, there are a few things you can adjust to start using the integrated widgets. First and foremost would be the Stream Labels. In OBS Studio this would be Text (GDI) sources that point to a text file written by the Stream Label Application but this is not needed anymore with Streamlabs OBS!
Remove the old Text (GDI) sources and replace them with the new built-in Stream-Label widget, found by clicking the + above the sources. If you do not see any widgets, make sure you are logged into Streamlabs OBS.
After you have done that, you can also replace the browser sources for the Streamlabs widgets with the build in widgets as well. Do keep in mind for the Alert Box, just like OBS Studio, that you place only one in a scene and manually copy and paste this as a reference into other scenes to avoid double sounding alerts.