Downloaded 7.4.6 won't open

My system is :- Lenovo desktop V530-071CB and Windows 11 x64.
I have had libre office for a while with no trouble and when it showed an update was available I clicked to download 7.4.6. The download seemed to complete but when I clicked on the Icon, the hourglass symbol showed briefly but Libre Office won’t open. Please can you suggest what to do.

With such a terse sentence, what do you expect?
EDIT your question (don’t comment: this is not a forum but a Question & Answer site where question can be modified) to provide at least OS name, where you download from and the procedure you followed to install.
Give as many details you can because we’re not sitting beside you and can see neither your screen neither your hands on keyboard and mouse. Failing this, I’m sorry to inform you my crystal ball is out for maintenance at the local wizardry shop.

There seem to be some aggressive anti-virus snake oils around that prevent from installing or newly installed/upgraded software from opening. At least there were several topics about such on here, use the search feature, not running Windows myself. Also see General Installation Issues (Windows) - The Document Foundation Wiki.

My system is :- Lenovo desktop V530-071CB and Windows 11 x64.
I have had libre office for a while with no trouble and when it showed an update was available I clicked to download 7.4.6. The download seemed to complete but when I clicked on the Icon, the hourglass symbol showed briefly but Libre Office won’t open.

Thanks erAck, I will try these sites

Thanks erAck I looked on the Windows Installation Issues site and tried the suggested Programs and Features repair facility and it worked, latest update now working.