"Install Labview 2020 sp1 community " cannot be opened because apple cannot check it for malicious software
Apps that are not distributed via the AppStore now require Notarization on top of being signed by a paid Apple Developer ID which means the developer must submit their application to Apple for review so that Apple can issue a notarization signature the developer can &quot;staple&quot; apply to the App. Otherwise you will see that warning and the App will not run by default.
To work around the problem: Open the /Applications folder with Finder.  Right-click the LabVIEW application icon and select Open.  A dialog will appear and you can allow the App to open. The App might immediately quit, try opening the App normally and this time it should work.
Send an email to the software vendor and ask them to Notarize their App for the newer macOS versions. At some point in the future, Apple may remove the ability to work around running an App that hasn't been notarized.