Im getting an error when trying to upgrade EPO version, I followed up docs instructions but yet cannot install the upgrade. please review attached image.
Maybe VirusScan policy prevent run application from TEMP folder.
Try temporary (bad) disable VirusScan or change temporary (good) VirusScan policy for that server.
Stop the following services (mcafeeframework & mcshield) and try again:
From the command prompt:
sc stop Mcafeeframework
sc stop Mcshield
Also, EPO 4.0 needs to be on patch 3 at the least to upgrade to 4.5.
You can disable your access protection policies from the epo_dashboard if needed. I have not seen it cause a problem very often with these type of upgrades. I would suggest you take a look at KB60569: Is the master article for these type issues.
You can also check on the database properties from the SQL studio manager and see if the autoclose feature is set to true. This can cause the connection to the database to be severed while the upgrade is in progress. To confirm this right click on the database inside the console, Choose properties, now go to options. In the middle of the window you will see under automatic the first option for autoclose set this to false.
If this fails use the KB above, it will take you through all the known causes for the error you are getting.
Hope this helps,