I am running Windows XP System 32 svc pak 2 with Firefox browser. I am repeatedly asked to update Adobe Flashplayer and when prompted, download the install.exe file, which downloads perfectly. After repeated attempts, the install.exe file will not open. Absolutely no response to double-click. Crickets.
You experiencing this issue because Flash Player deliverable is Sha-256 certificate signed and XP SP2 does not support sha-256 signing technology. This was implemented from XP SP3 onwards. We recommend you to upgrade your OS.