Acrobat

I know its no longer supported BUT, i am a retired 74 year old and was very happy using CS4 for my charity leaflets etc.  I used Acrobat 9 Pro.  I allowed an update to latest Acrobat, which is very nice but i cannot afford to use a monthly license - i only use it 2 or 3 times a month.  I need to get Ver 9 back on but whenever i try to reinstall it stops and “preparing to install”.  It installed when i first upgraded my machine onto Windows 11.  Please help - i feel a little cheated because it was wall working fine.  CS4 still works fine, its just the Acrobat 9 Pro that has gone.