Changes: (changes marked* refer to the paid version only)

1.3.2
- enabled options that were previously not available for free.
- free version can count PDF pages of 20 PDF files at a time.
- free version can join up to 200 PDF pages in total.
- fixes and improvements.
- verifies authenticity for downloaded files while updating.*

1.3.1
- enabled basic compression to reduce output size.

1.3.0
- joins PDFs to a new file each time instead of overwriting.
- option to remove digital signatures when joining.*
- option to number pages when joining.*
- dedicated mode for removing digital signatures.*
- fixes and improvements.

1.2.1
- fixed an issue in the portable version update process.

1.2.0
- can join PDF files from a folder.
- will also process subfolders.*
- can process files dropped in window also.
- app can check if there's a new version available (see F1 help).

1.0.2
- files sorted before operation.

1.0.1
- can count pages of PDF files.
- folders sorted before operation.