You have to go into Windows security and make some changes.
Start>settings>updates & security>windows security>virus & threat protection>virus & threat protection settings>manage settings>Exclusions>add or remove exclusions>+ add an exclusion
Now add folder "C:/Program Files/OpenLP"
Also add file "C:/Program Files/OpenLP/OpenLP.exe"
You might have to turn off defender during the install process, then add these exceptions before turning Defender back on. Defender will remove the files.