Hello, Why dont you use command line instead? 
Packages:
netpbm - Graphics conversion tools
libtiff-tools - TIFF manipulation and conversion tools

[download]

and after that....

    tiffcp - combines one or more files created according to the Tag I
+mage File Format, Revision 6.0 into a single TIFF file.  Because the 
+output file may be compressed using a different algorithm than the in
+put files, tiffcp is most often used to convert between different com
+pression schemes.

[download]

and after that...

    tiff2pdf opens a TIFF image and writes a PDF document to standard 
+output.

[download]

In reply to Re: Merging Tiff Files by dpetrov
in thread Merging Tiff Files by Shinama

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