Yes, I had the same problem with sysaid upgrade, then I follow instructions to install free edition, finally I put my good license, so It converts aplication from free edition to legacy edition.
Now I have a PRO PLUS version installed.
I have SYSAID installed in a Linux CentOS 6.8, with Apache Tomcat 7.0.70, and working with MySQL 5.6 (the database are in another server).
I look for a full installation of SysAID for Linux with the last version, but i don't found in sysaid website. The last full version I installed from scratch was 14.x and I was thinking the last free sysaid version downloaded will be 16.1.25, and my surprise when I start aplication and I see it was 15.4.16.
I make something wrong? How can I upgrade to 16.1.25?