If you are getting 504 error while installing then Uninstall Apps2SD free version(Export folder mounts if any), Wipe dalvik-cache, Clear play store data and cache, reboot and try again it will work.
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How to Install:-
1. Read Install Note. [In Download Software]
Dear friends you have to successfully install this software on your computer or laptop. If you have to any problem regarding to installation process on your computer or laptop, then please you can share your problem and difficulty with me in the comment box. So I have to solve your problem regarding installation this software.
1. This Program Provided For Only Education Purposes.
2. If You Like This Program, Support Developers, Buy It! They Deserved It
3. I am not responsibility if any problem regarding to install this program on your Android Mobile.
Apps2SD PRO All in One Tool v8.7 [APK]