1: are you installing on your /data partition, or the regular way (to sdcard)?
2: navigate with your file manager to
/sdcard/Android/data/sts.pl
and delete the whole folder
restart PL and it should fix the issue.

Furthermore, CHECK if you have enough space on your sdcard. This might be what is preventing you from saving Android005.apk and the rest, since all of these are downloaded to the sdcard.