Remember that GP 5.2 can open .gp3 , .gp4 , and .gp5 files, but it cannot open files created in Guitar Pro 6 or higher unless they are exported as 5.0 compatible.
Because of its stability and low system requirements (only 256MB of RAM!), many professional musicians still use it today via workarounds like Crossover or virtual machines to avoid the "bloat" of newer versions. 2. From Tabs to Artificial Intelligence (Modern Research)