Hi Tim, thank you for your reply. Yes this is legitimate signed copy of the 
installer. The Mac is already run in Catalina so I know this will Not  be an  
issue.

On 17 Jun 2021, at 04:15, 'Tim Kilburn' via MacVisionaries 
<macvisionaries@googlegroups.com> wrote:

Hi,

My first questions is, where did you get the Catalina installer from?  If it is 
not a signed installer from Apple, you will have problems trying to install it. 
 Second, what system version is currently on the Mac?  Finally, are you 
positive that your 2012 MacBook Pro will support Catalina?  It needs to be the 
mid 2012 model or newer.

Later…


Tim Kilburn
Jamf Certified Tech
Apple Professional Learning Specialist
Apple Teacher
(with Swift Playgrounds Recognition)
Fort McMurray, AB Canada

> On Jun 16, 2021, at 8:52 PM, sound.w...@gmail.com <sound.warrio...@gmail.com> 
> wrote:
> 
> Hi everyone hope you're doing well and staying safe. I have a 2012 MacBook 
> Pro 8gb ram 1tb hd 2.9gb i7 dule core processer. I have an application file 
> of  the Catalina installer, I want to clean install Catalina on this Mac. 
> When I open the application file  absolutely nothing happeneds. Does anybody 
> have any idea as to why this could be or how   I can solve this problem? 
> 
> Thank you very much for your help good people take care and stay safe 
> everybody :-)
> 
> 
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