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I just checked the Irfanview (now in version 4.10 and still free) and here is what you can do with it:
1. batch convert png files to pdf files (extremely fast)
2. convert png files to one pdf file in three steps:
2a. batch convert png files to tif files
2b. merge tif files to one multipage tif file (menu operation)
2c. save multipage tif file as pdf (menu operation)
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