I got a new machine and re-installed InDesign CS5 on the new machine. I tried to run the updates but I get this error.
Adobe Extension Manager CS5 5.0 Update
There was an error downloading this update. Please quit and try again later. Error Code: U43M1D207
I'm hoping this is the reason why I can't open any of my old files.
I tried chat support or email but apparently if you don't pay Adobe monthy for a subscricpiton they don't really care..
Errors 201 & 205 & 206 & 207 or several U43 errors
Also, if Mac El Capitan or Windows 10, your old program is not compatible and will not be updated
That plugin error indicates the file was saved in a newer version than CS5 and has nothing to do with extension manager.