Since OS X 10.7 Java is not (pre-)installed anymore, let’s fix that. As I’m writing this, Java 11.0.4 is the latest version and AdoptOpenJDK is one of the best places to find Prebuilt OpenJDK Binaries. Easy to follow details about how to install OpenJDK are available here. Oct 22, 2019 Installing legacy Java on macOS Catalina. If you try to run the sample app by typing flutter run, you might get a popup that you need to install Java for Mac. Jun 16, 2020 When you're ready to install, just open the file named Install macOS Catalina from your Applications folder. Learn more If the installer shows a list of apps that are not optimized for your Mac, learn about 32-bit app compatibility, then choose whether to proceed with the installation.
With macOS Catalina officially released, more and more people jump on the bandwagon to try its expanded features, such as screen extension with an iPad or the new Apple Podcasts app. And why not?
The problem is that it might not always work as intended. Glitches in macOS Catalina are commonplace — even fully released operating systems like Mojave or High Sierra could freeze and crash from time to time. No software is immune.
Oct 15, 2019 Some users are clean install advocate, saying they’ll result in less buggy software. MacOS Catalina itself is said to be fairly buggy, in addition to problems with app compatibility and the end of 32-bit software. To put it another way, some users may want to clean install macOS Catalina when they would normally just perform an App Store install.
I am working on a clean install of Catalina and Xcode 11. If you are trying an upgrade, or using a different version, your experience may be different. If you run into problems post a comment and I’ll do what I can to help out. And so, without further ado Install MacOS Catalina; Install XCode 11; Launch XCode. Agree to the license agreement.
Oct 10, 2019 I had the same popup reappear after installing Catalina. The fix, for me was rather simple, and quite stupid. After downloading the Java pkg I clicked on the installer and got the same security alert that others did. I then went to the window and right clicked on the pkg and selected Open. This allowed the pkg to install normally.
But what do you do if this case? The surefire way to deal with jaded performance is to reinstall mac OS Catalina altogether. Read through our guide below to learn how.
How To Reinstall Mac OS Catalina
It’s important to note that when you reinstall macOS Catalina the process simply updates the operating system and doesn’t affect any files on your hard drive or user files or even settings. That makes reinstalling principally different from performing a clean install, which erases everything.
Here are the proper steps to follow to reinstall mac OS Catalina.
1. Back up your Mac first
By default, the best thing you could do before making any significant changes to how your Mac works is to back it up. Backups are just like saves before encountering challenges in video games — represent the point you can always come back to.
There are lots of great backup solutions on the market to suit every need. If you don’t have the time to search for something specific, your Mac features a decent native option — Time Machine.
To get Time Machine started:
Connect an external USB or WiFi hard drive to your Mac
Go System Preferences ➙ Time Machine
Click on Select Backup Disk…
Press Use Disk
2. Delete junk off your Mac to speed it up
There’s nothing better than the feeling of a brand new Mac with a brand new macOS. If only the latter is new, the experience could be subpar. Trying to get the most out of macOS Catalina on your older machine might be a challenge. But don’t hurry to your local Apple Store just yet — not all is lost.
Install Java 8 Mac Catalina
Just like the dust behind your couch or on the top of your kitchen cupboards, small bits of system files, caches, and hidden libraries tend to aggregate over the years and never get deleted, eventually slowing down everyday processes. While it’s possible to clear out some of them manually, others require specific technical knowledge and lots of time.
Luckily, there’s a professional automatic solution available — CleanMyMac X. Optimizing behind-the-curtain processes on your Mac with CleanMyMac X is no more difficult than clicking a single button:
Download a free trial of CleanMyMac X
Open the app and navigate to System Junk in the left-side panel
Click Scan and wait for the process to complete
When done, press Review Details
Uncheck anything you’d like to keep and click Clean
Now your Mac is free of all the pointless log files, user caches, language files, old updates, and more. Which directly translates into improved processing power, memory usage, and response time. At last, your Mac is ready to take full advantage of macOS Catalina.
3. Reinstall macOS Catalina in Recovery Mode
With your Mac in top shape, it’s time to get that macOS Catalina download link. Surprisingly, you won’t find it in Software Update or even App Store (where it used to be in macOS High Sierra).
The correct way to reinstall macOS Catalina is to use your Mac’s Recovery Mode:
Restart your Mac and then hold down ⌘ + R to activate Recovery Mode
In the first window, select Reinstall macOS ➙ Continue
Agree to the Terms & Conditions
Select the hard drive you’d like to reinstall mac OS Catalina to and click Install
The reinstallation process will start shortly and roughly take 30 minutes. When complete, your Mac will start up as usual. No files should be lost, but it’s always a good idea to check CleanMyMac X’s Applications Updater to see if you can improve compatibility of the new macOS with any of your existing apps:
Launch CleanMyMac X
In the left-side panel, navigate to Updater
View any available updates and their notes and click on Update
Finally, in case you notice any files or apps missing, or settings misconfigured, you could open up Time Machine to restore a specific folder or the whole backup from the step one:
Launch Time Machine from Applications
Simply scroll all backup versions to find the file you’re looking for
Click Restore
If you decide to restore the whole backup, make sure to then repeat the whole process to optimize your Mac and reinstall macOS Catalina as detailed above. The good thing is that more often than not the reinstallation works wonders right from the first time.