If you just need operators to see the screens (Runtime), you might be able to upgrade to InTouch 2014 R2 or 2017 and open the 10.5 app. The conversion tool usually handles 10.5 .APP files well. Scripts may need tweaking, but graphics usually convert.

The 10.5 build is remarkably stable. Once a DAServer connection is established to the PLC, the system can run for years without a reboot. "If it isn't broken, don't fix it" is the golden rule of industrial maintenance.

Unlike PLC programming, the HMI uses a tag database. In 10.5, you have two types:

Pro Tip: Use the DB Dump tool (DBDump.exe) to export tags to Excel for bulk editing. Manual editing of each tag is agonizing.