I installed node and Mongodb in Windows7 at the same time. Another installation inprogress. You must complete that installation before continu.  
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The original: https://support.techsmith.com/hc/en-us/articles/203730938-Snagit-Windows-Error-1500-1618-Another-installation-is-in-progress-You-must-complete-that-installation-before-before-proceeding-with-this-inst all
Snagit (Windows) : Errors 1500, 1618: Another installation is in progress. You must complete the installation before you can proceed with the installation
Last Update:
June 13, 2019 18:27
 
The problem
While installing the software, I received an error message indicating that another installation was in progress.
solution
Restart the computer, and then try to install Snagit again. If you still receive an error, do the following:
Windows 10 or Windows 8

press CTRL + ALT + DEL and open task manager. Click on the bottom left corner for more details. On the Processes TAB, click to select Windows Installer under Background Processes. Click the end task button. Install Snagit again.

Windows 7

press CTRL + ALT + DEL and open task manager. On the Processes TAB, right-click msiexec.exe, and then select End Process to install Snagit again.