The apk sizes and md5 are listed also on TopoDroid site (speleoapps).
Apks marked as "Beta" are unstable.
Before installing an apk on your Android verify that it has the proper
size and md5.
Get the apk from here, and size/md5 from TopoDroid sitepage
https://github.com/marcocorvi/speleoapks,
which should coincide with the values on this page.