Win32 Cabinet Self-Extractor is not running the application

This seems like an issue that should be directed to the publisher of the HVAC software.

If the file for the service pack is a Windows cab file (*.cab), you can extract the contents manually and see if there is a "setup.exe" or similarly-named *.exe file to run the installation.

Although CAB files can be extracted using native Windows tools, I find it far easier to use (free) 7-zip (https://www.7-zip.org/).  7-zip will also let you view the contents of the CAB prior to extracting, so you can see if there is, in fact, a setup.exe file there.

Another option would be to restart the computer in a "clean boot" configuration and try to do the installation there.  If you have some software that's running in the background that is interfering with the installation, restarting in clean boot could well solve the problem.

1. Click Start and type msconfig in the search box.
2. Press Enter.
3. On the General tab, click Selective startup.
4. Clear the Load startup items check box.
5. Click the Services tab.
6. Select the Hide all Microsoft services check box (at the bottom).
7. Click Disable all.
8. Click OK.
9. Click Restart.

After completing your troubleshooting, restore your system by doing the following:

1. Click Start and type msconfig in the search box.
2. Press Enter.
3. On the General tab, select Normal startup.
4. Click OK.
5. Click Yes when asked to restart your computer.