Fix Figure plugin will not use

- Fix Figure plugin will not use
- Update image to light theme

Author: Nirus2000

docs/en/reference/help/check-updates.md

@@ -43,10 +43,19 @@ Figure: Install update successful {class="pp-figure"}
 
 ![](images/check-for-update-successful.png)
 
+!!! Tip
+    If the update process fails (e.g. due to missing permissions or network issues), you can always download and install the latest version manually from the [official website](https://www.portfolio-performance.info/).
+
 ## Automatic Check for Updates
 
 Automatic update checks are enabled by default. To change this, go to `Help > Settings > Updates` and toggle `Check for updates on start`:
 
 Figure: Automatic update check setting {class="pp-figure"}
 
 ![](images/automatic-check-for-update.png)
+
+!!! Note
+    The automatic check is performed only when the application starts. There is no background download or silent installation.
+
+**Technical Info**
+The update check fetches data from [`https://updates.portfolio-performance.info/portfolio`](https://updates.portfolio-performance.info/portfolio). If the update check fails, check your internet connection or firewall/proxy settings. Manual updates are always possible via the [download page](https://www.portfolio-performance.info/).