Don’t update your Mac to macOS Catalina without doing some serious checking first. The new Mac operating system makes some deep changes, which means that at least a handful of apps on your Mac.
Why would you update to a new OS when using such an old program. Catalina is 64 bits only no 32 bits program can run on Catalina. Uninstallers might very well be 32 bits. I think its the end of the road for CS4.
Guide: Update Directly to macOS Catalina. Update your existing Clover install to version r4910 or higher using MultiBeast or official Clover package. Open Clover configuration folder on the root of your system drive or EFI Partition using EFI Mounter v3.

macOS Big Sur elevates the most advanced desktop operating system in the world to a new level of power and beauty. Experience Mac to the fullest with a refined new design. Enjoy the biggest Safari update ever. Discover new features for Maps and Messages. And get even more transparency around your privacy.

This should help make more space available and you can then use it for installing the Catalina update. Remove and Re-donwload Catalina Update again. If you're having problems downloading and installing Catalina update via Software Update or Mac App Store, you can remove the download and redownload the update again.

Check compatibility

macOS Big Sur is compatible with the following computers. If your Mac isn't compatible, you might be able to install an old version of macOS instead.

Can't Update To Catalina 10.15.5

MacBook introduced in 2015 or later
MacBook Air introduced in 2013 or later
MacBook Pro introduced in late 2013 or later
Mac mini introduced in 2014 or later
iMac introduced in 2014 or later
iMac Pro
Mac Pro introduced in 2013 or later
View the complete list of compatible computers.

Can't Update To Catalina 10.15

If upgrading from macOS Sierra or later, your Mac needs 35.5GB of available storage to upgrade. If upgrading from an earlier release, your Mac needs up to 44.5GB of available storage. To upgrade from OS X Mountain Lion, first upgrade to OS X El Capitan, then upgrade to macOS Big Sur.

Download macOS Big Sur

If you're using macOS Mojave or later, get macOS Big Sur via Software Update: Choose Apple menu  > System Preferences, then click Software Update.

Or use this link to open the macOS Big Sur page on the App Store: Get macOS Big Sur. Then click the Get button or iCloud download icon.

Install macOS Big Sur

Can't Update To Catalina

After downloading, the installer opens automatically. Click Continue and follow the onscreen instructions.

Please allow installation to complete without putting your Mac to sleep or closing its lid. During installation, it might restart and show a progress bar or blank screen several times. You might find it easiest to begin installation in the evening so that it can complete overnight, if needed.

Stay up to date

After installing macOS Big Sur, you will be notified when updates to macOS Big Sur are available. To check for updates, choose Apple menu  > System Preferences, then click Software Update.

Cant Update To Catalina