Karlstens75 gave an adobe air installer that does not install anymore.
I always get the error the installer file is damaged.
I looked into it and it seems that some kind of key has expired, the issue seems to be on adobes side, tho they vehemently deny this.
The easiest workaround is to rollback your system time to a date before 2007, install the game then revert back.
The newest anniversary release seem to have a newer key which don't have this issue.
I just posted this in case anybody else waants the old skin back yet are not able to rollback to a previous version.
TLDR: If you get installer file is damaged error set your system time to 01 01 2006, then it will install, then you can set back your system time.