after downloading update - it refuses to accept my password - i've tried everything including chaging my password

Hi barbaraw47207524‌,

If you see a password prompt this password prompt is presented by your operating system, and is intended to keep you from accidentally installing software.

If this is your personal machine and you don't need a password to log into the computer when it first starts up, you can probably leave the password blank and click OK to get past this prompt.  If this is your personal machine and your normal password isn't working, check to make sure that CAPS LOCK is off, and type the password carefully.

If this is your work machine and it's asking for an Administrator password, well, you'll need to have a conversation with your friendly IT person.

If you're still stumped, you may need to reset the password on your Mac:

http://support.apple.com/kb/PH18653

http://support.apple.com/kb/PH14325

http://support.apple.com/en-us/HT201240